Upton Sinclair Novels

The title "One Night Stand with My Ex's Uncle" is a dramatic and emotionally tangled romance. It's suggestive of themes like betrayal, forbidden love, and possibly redemption or scandal. This type of story typically thrives on emotional tension and unexpected twists. The "uncle" character is not protective, rather it mysterious, and in form of a foil to the ex, offering the protagonist a new perspective or emotional safety. these novels often explore deep feelings of guilt, longing, and the complications of moving on — especially when ties to the past remain strong.

One reckless night. One dominant stranger. One obsession that refuses to end. Ava Sinclair thought the dark, sinful stranger she met at an exclusive club will be a fleeting escape from her suffocating life. But Damien Blackwell doesn't let things go easily. Marked by a single night of passion, Ava is dragged into Damien's world. A world of power, jealousy and secrets. He owns the night, and now he wants to own her. But Ava isn't one to be caged...or is she?

She begged him to save her. Now, she belongs to a monster. She should have died with them. That’s what the man who slaughtered her family whispered in her ear as he dragged her away from the blood-soaked floor of her childhood home. But instead of a quick death, he had other plans. A girl as rare and beautiful as her was worth more alive than dead. And so, Evadne Sinclair was thrown into a cage, hidden beneath the filth of the underground, waiting to be sold to the highest bidder. When she was forced onto the auction stage, chains biting into her wrists, she knew begging was useless. The men before her were nothing but predators, circling their prey, hungry to devour. She had no savior. No way out. Until him. Dante Moretti. Cold. Untouchable. The Mafia’s deadliest king. She didn’t know why she begged him—only that she did. > "Than…thank you…" she shuddered, her body tangling as the chains rattled behind her while she walked alongside the mean-looking man she believed had just saved her from a worse fate. He was cold. Mean. She didn’t know why she thought he was the best man to save her. She only found herself begging him to. He raised his amber eyes to her, a slight smirk cutting across his face. "What’s your name?" If she was shaking before, now she was trembling violently at his sudden cold and authoritative voice. "Evadne Sinclair." "Good, Evadne. Don’t thank me." His voice was like ice. Deadly. Final. "Because two hours from now, you will regret ever begging me to buy you." One thing Evadne had no idea of was, Morretti don't save, he owns. Recommended for readers 18+.

Emery Sinclair had spent years perfecting the art of being the perfect wife. The devoted, loyal, and elegant Mrs. Sinclair. Even when whispers of her husband's infidelity trailed after her like a ghost, she held her head high, convinced that love—her love—was enough to fix the cracks in her marriage. But the moment she walks into that hotel suite and finds her husband entangled with another woman, something inside her shatters. She doesn’t cry. She doesn’t scream. Instead, she walks away, her heart numb, her mind spinning. The life she built is over. The man she sacrificed everything for never deserved her. Then comes Killian Wolfe. Cold, calculating, and ruthlessly powerful, Killian is everything her husband is not. And he is done watching from the sidelines. For years, he’s kept his distance, biting his tongue as his foolish stepbrother squandered the one good thing in his life. But now? Now, Killian doesn’t hold back. He steps in—offering her a way out, a place to stay, and, most dangerously, a deal she never saw coming. "Let me take care of you," he tells her, his voice a low, commanding whisper. She should say no. She should run. Because nothing about Killian Wolfe comes without a cost. But the way he looks at her—like she’s something precious, something worth ruining kingdoms for—makes her wonder if, just this once, she should let herself be wanted. The game changes in a single night. A kiss turns into something more, and before she knows it, she’s tangled in his sheets, in his world, and in his control. But Killian doesn't just want her in his bed. He wants everything—her body, her mind, her soul. And most terrifying of all? He wants her heart.

At eighteen, during the Crescent Moon pack's full moon festival, the young wolves had their first shift. It was at such an event that Lyric Adams discovers that she has all the attributes of a werewolf minus the wolf and is shunned by her pack, banished by the Alpha, Gregory Sinclair, then chased from the only family and home she's ever known. Having to leave with just the items on her person, she heads into the dark forest in tears to places unknown and scents she's unfamiliar with. Knowing that she must survive, she hopes to find a small human village to start anew.  Unfortunately, Lyric’s life goes from bad to much worse...

Bound by debt and haunted by a past she can't speak of, Annamaria is offered as a bride to Ares de Luca Sinclair, the ruthless head of the Sicilian mafia. He needs her secret; she craves revenge. Ares believes Annamaria holds the key to stopping a Russian mob invasion, but he doesn't know she blames him for her family's massacre and has vowed to get her revenge on him. As their lives intertwine, the lines between enemy and lover blur. But their fragile bond is threatened by a vengeful half-brother hungry for Ares's power, a scorned woman determined to reclaim her place by his side, and a forbidden love that refuses to be denied. When the truth is finally revealed, Annamaria finds herself a pawn in a deadly game. Kidnapped and tortured, she's forced to confront the secrets she's desperately trying to protect. Ares, consumed by betrayal, unleashes his fury, unaware he's playing right into the hands of his enemies. Will their love survive the lies, the betrayals, and the ever-present threat of the mafia underworld? Or will their dangerous dance end in heartbreak and ruin?

Ivy Sinclair never expected her father's last desperate move to be selling her off like a pawn—to the coldest billionaire in Manhattan. Lucien Blackwood doesn't believe in love. But he believes in power, and marrying Ivy gives him just that—until the fire in her eyes threatens to melt the ice around his heart. Their vows are signed in ink and built on lies. She’s determined to protect her soul. He’s hiding demons that could destroy them both. But what starts as a calculated business arrangement spirals into a dangerous obsession. Secrets bleed. Betrayals burn. And when the past comes back with blood on its hands, their fragile union may be the only thing standing between survival and ruin. He owns her name. She could own his heart. But only if they don’t destroy each other first. In this house of fortune, love is the most dangerous currency.

Rachel Sinclair lost everything when a fraud conviction destroyed her life as a social worker. Five years later, she's reinvented herself as Raven Steele—a woman with a clean past and a dangerous mission. Her target: the Diamondback Motorcycle Club, a vicious criminal organization that operates with impunity while the system looks the other way. Using the forgotten murder of a small-time dealer as her cover story, Raven infiltrates the deadly world of motorcycle clubs. But her carefully laid plans collide with Jax Savage, the devastatingly dangerous president of the Savage Saints MC. Muscular, tattooed, and lethal, Jax has been waging his own war against the Diamondbacks since they murdered his younger brother. What starts as a tactical alliance quickly ignites into an attraction neither can resist. As Raven goes deeper undercover with the enemy, feeding intelligence to Jax while maintaining her cover, the line between duty and desire blurs. But in a world where trust is a weapon and love is a liability, their growing connection threatens to destroy everything they've worked for. When Raven's deception leads to a devastating blow against the Diamondbacks, she becomes the target of a deadly bounty. Forced to reveal her criminal past to the man she's falling for, she must decide if their connection is strong enough to survive the truth. With enemies closing in and a war erupting in the streets, Raven and Jax face an impossible choice: save themselves or save each other. In the savage world of motorcycle clubs, some hearts are worth fighting for—and some are worth dying for. *Content warning: Contains explicit language, violence, mature themes, and sexual content. Recommended for readers 18+.*

 Ivy Sinclair was born to be forgotten.  Ivy, a wolfless runt of the Bloodfang Pack, had little choice but to disappear into the shadows after being turned away by Alpha Killian Wolfe. However, a long inactive power awakens within her when Killian's brutal rejection leaves her broken and alone. She lives as something darker, strong, created by sadness and wrath, rather than the weak girl she was before. Centuries old, a prophecy was said out loud: "Born of light, born of shadow, a queen without a crown, a wolf without a pack... The forsaken will cry out, and the broken will rise. With the rogue king, Ronan Devereaux, by her side, Ivy sets out to tear down the empire Killian built. But the path to vengeance is not without its cost, and Ivy soon discovers that the darkness within her runs deeper than she ever imagined. Her soul is bound to something ancient, and when Killian returns, desperate to reclaim her, Ivy must face a choice that will shatter everything she’s fought for. The storm is rising, and Ivy is no longer the one who will be broken. She is the one who will break everything.

Ava Carter is barely making ends meet while taking care of her little brother. When billionaire Colton Sinclair offers her an unexpected deal—to carry a child for him—she’s hesitant but desperate enough to accept. The baby isn’t his, but his late sister’s, and after the original surrogate disappeared, he’s running out of time. What starts as a business arrangement soon grows complicated. As Ava and Colton spend more time together, their connection deepens, and emotions they never expected begin to surface. But when secrets come to light, will their deal bring them together—or tear them apart?