The Fifth Vital Sign

After my fiance’s childhood friend found out I was born with a heart condition, she secretly poured a high-dose energy drink into my champagne. The moment I drank it, my heart started racing, and stabbing pain spread through my chest. In a panic, I tore open my only emergency medication, but the water I used to take it had been swapped with strong lemon water. As soon as I drank it, my face went pale. I lost all strength and collapsed to the ground. “Lemon water’s full of vitamin C. It helps with hangovers and keeps you healthy.” Charlotte Whitmore laughed so hard she nearly doubled over. With her arms crossed, she looked at my fiance, Ethan Cross, the boss of the Rolling Stones. “Ethan, your fiancee’s acting is incredible! “I’ve been a doctor for years, and I’ve never seen anyone react like this to a little champagne and lemon water.” I bit my lip until I tasted blood. The pain made my eyes sting, and I clutched Ethan’s leg. “Honey, please, call an ambulance! I can’t take it anymore…” For a moment, his expression wavered, but the guests quickly cut in. “Come on, stop pretending! Nobody dies from a bit of champagne and lemon water.” “Yeah, you’re just jealous Charlotte got promoted and didn’t want to toast to her.” Ethan’s face turned cold again. He yanked my hand off and stepped away. “Charlotte’s a doctor. You’ll be fine with her here.” I stopped begging and texted my father asking for help.

Emma Hart thought she led an ordinary life—until a single mysterious message changes everything. When her phone flashes a countdown and a distorted voice warns her not to look outside, Emma realizes she’s caught in a deadly game she doesn’t understand. Shadows move faster than any human, storms rage with unnatural fury, and the city she calls home becomes a maze of fear and secrets. With only twelve minutes to act, Emma must uncover who—or what—is hunting her, why she was chosen, and how to survive when time itself seems to be against her. Racing against a relentless enemy, she discovers hidden powers, buried truths, and the shocking revelation that the world is far more dangerous than anyone could imagine. The Last Signal is a pulse-pounding thriller that blends suspense, supernatural mystery, and heart-stopping tension, asking one question: when the clock is ticking, who can you trust—and who is already watching from the shadows?

"This is a notice regarding proper use of the air conditioning. Please sign to acknowledge receipt." My six-year-old son stood there with a stern little frown, slapping a sheet of paper down in front of me. I glanced at the page. Written in colorful marker were several neatly listed "charges." The whole thing felt absurd. When I did not respond, he pointed at the paper like a tiny adult. "Mom, you didn't turn the air down in time yesterday. That could've affected my health. It was very irresponsible." I looked toward my husband, who had just gotten home from work, hoping he would say something, anything, in my defense. Instead, he snatched up the paper and slapped it down on the table, his voice sharp. "Can't you be more attentive? Our son's health comes first. If you can't even handle something this simple, what kind of mother are you?" With someone backing him up, our son's eyes immediately reddened. He burst into tears. "Mom doesn't love me!" The two of them, playing judge and jury, left me suddenly breathless. "Fine," I said at last. "If I'm such an unfit mother, I'll leave. Let your father find you a new one, someone who knows how to set the air conditioning properly."

The first sign wasn’t the deaths. It was the air. When twenty-five-year-old ER doctor Naomi Sinclair notices healthy people collapsing for no medical reason, she expects to find a virus, a toxin, or something medicine can explain. Instead, every test points to the impossible. Her patients are breathing. Their blood carries oxygen. Yet their bodies are dying as if they never inhaled a single breath. As panic spreads across New York and all over the world, a powerful company called Aelion introduces a revolutionary device that seems to keep people alive when nothing else can. At the center of it is Aiden Vale, a calm, brilliant executive who always seems to arrive with exactly what the world needs. The more Naomi works beside him, the harder it becomes to ignore the connection growing between them and the questions she can’t stop asking. Then a scientist disappears after revealing a terrifying discovery on live television. Mysterious warnings begin appearing in Naomi’s life. Overnight, the impossible becomes ordinary, and she soon realizes the greatest threat may not be the people who are dying, but the reason they’re dying at all. As the air grows deadlier and the line between salvation and deception begins to blur, Naomi must decide who to trust before every breath becomes a luxury. But when the person holding the answers is also the man she’s falling in love with, how do you save the world without losing your heart… or your very last breath?

I can hear the voices of every organ in the human body. In my three years of practicing medicine, I've never misdiagnosed a single patient. For instance, a young man with wobbly legs comes in for a consultation, suspecting he has a terminal illness. His kidneys, however, start cursing up a storm. "You're juggling eight girlfriends at the same time. Even a workhorse on a farm doesn't get worked this hard!" I try my best not to laugh, prescribe him some supplements, and casually suggest he learn a little time management. Then, a well-dressed white-collar professional walks in and tells me she's experiencing heart palpitations and dizziness and insists that she must have congenital heart disease. Her heart immediately protests loudly in my ear. "You drink three iced Americanos a day! I'm about to burst out of your ribcage and start doing calisthenics!" I smile and prescribe her some chamomile tea. Less than half a month later, she returns with a healthy, rosy complexion to present me with a banner of appreciation. From that moment on, I earn the nickname "the Human X-Ray". … One afternoon, a woman walks in with a listless-looking boy. Maeve Brown looks sick with worry. "Dr. Young, please take a look at him! Lennon has been suffering from headaches, and he has already taken several days off school due to them." However, his brain is practically throwing a party in my ear. "Hell yeah, I successfully skipped class! I'm going to grind ranked matches all night long!" I smile as I diagnose him with malingering, and Lennon White goes home with a flushed face. Ten days later, Maeve and Hubert White burst into my office. This time, Lennon's complexion is pallid. Bracing himself against the doorframe, his body sways uncontrollably. Initially, I assume he's putting on another performance. However, the moment I hear the voices emanating from within his body, my mind goes blank. I immediately push him out of the room and dial 911. "I'd rather treat a dog with this condition than treat you!"

When I woke up that morning and happened to glance at the mirror, a scream tore from my throat before I could stop it. Because on the face I had always taken such pride in, there was now a jagged, horrifying scar. As terror gripped me, a cool, detached female voice cut through the air beside me. "What are you shrieking about so early in the morning? Scared by your own ugly face?" I looked up in shock and realized the voice belonged to my girlfriend, Alicia. Only—she wasn't the same girl from yesterday. Gone was the youthful innocence I remembered. In its place, every movement, every glance radiated the allure of a mature woman. The words slipped out before I could hold them back. "Babe… you're gorgeous…" But Alicia's brows knit together, her gaze colder than ice. "Kurt, drop the act!" Act? I was at a loss. Why would she accuse me of pretending? "Don't call me the way you used to five years ago. It's disgusting." Five years ago? But… I'm still twenty-three… am I not?