Upton Sinclair Novels

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?

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 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.

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?

When Luke agreed to marry Lucy Radcliffe to secure his inheritance, Eva had no choice but to walk away. But fate has a twisted sense of humor. Lucy, determined to spite Eva, hires her as the wedding planner for the very event that broke her heart. Despite the pain, Eva takes the job, knowing it’s the perfect opportunity to elevate her brand. But as the wedding preparations force Eva and Luke into close proximity, old feelings resurface, and Luke begins to question his choices. Torn between his duty to his family and his rekindled love for Eva, Luke finds himself in a web of desire and obligation. Enter Gavin Sinclair, Lucy’s arrogant billionaire cousin, who becomes smitten with Eva at first sight. As Gavin relentlessly pursues her, Eva finds herself caught in a tangled love triangle—or perhaps a love quadrangle—where emotions run high, and the stakes are even higher.

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?

> I died loving him. I returned to destroy him. Aria Sinclair gave everything to Damon King — her love, her loyalty, her name. But when his betrayal shattered her world and drove her to her death, she swore one thing with her final breath: she would never love him again. Now reborn five years later with a new identity and sharper mind, Aria re-enters Damon’s life as a powerful investor bent on dismantling his empire piece by piece. But Damon isn’t the cold-hearted man she remembers. He's tormented by regret... and still haunted by her memory. As secrets unravel and passion reignites, Aria finds herself caught between the vengeance she craved and the love she once buried. Can she truly ruin the man who still owns her heart? Or will her kiss become his salvation instead of his downfall?

“Two men. One woman. A dangerous game no one survives unscathed.” Aria Sinclair, billionaire heiress, craves freedom from her father’s control, until a shadowy enemy hunts her with chilling threats. Trapped with two bodyguards, icy Damien and fiery Kade, she fights their protection, only to ignite a forbidden passion that consumes them all. As a vengeful Ghost from her father’s dark past closes in, Aria must navigate betrayal, desire, and a love that could save or destroy her. Her Dangerous Affair is a steamy, suspenseful tale of danger, devotion and forbidden love.

 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.

Elliot Sinclair has it all—money, power, a picture-perfect fiancée, and the eyes of the world watching his every move. But behind closed doors, his life is anything but perfect. Because Elliot is in love. With Jonah Hartfield. A man. Jonah is everything Elliot shouldn't want—fierce, reckless, possessive. Their affair is a powder keg of passion and danger, one kiss away from destruction. The world can't know. His family can't know. And Clara, the woman he’s supposed to marry for the cameras, definitely can’t know. But Jonah is done playing games. He doesn’t care about appearances. He doesn’t care about the cameras. He just wants Elliot. Completely. And he’s not interested in sharing. When jealousy boils over and secrets get harder to hide, Elliot is forced to choose: keep pretending for the world—or burn it all down for the man he can’t live without.