40,000 feet in the air. No escape. No second chances. Flight 417 was supposed to be routine, a nonstop long-haul journey from London to Singapore. But somewhere over the cold expanse of the Indian Ocean, something goes wrong. A chilling message appears on the in-flight screens: "One of you will not survive this flight." With the cockpit sealed off and communication with the ground mysteriously cut, panic erupts in the cabin. A passenger is found dead under suspicious circumstances. Then another. Paranoia spreads like wildfire as those aboard realize the killer could be anyone, crew or passenger, ally or stranger. Air Marshal Kiran Dev has been trained for every imaginable crisis. Except this one. With trust shattered, time running out, and oxygen thinning at altitude, he must unravel a deadly conspiracy 35,000 feet above solid ground, where there's nowhere to run, and every decision counts. What begins as a high-altitude nightmare soon becomes a deadly race for survival. Fasten your seatbelt. You're in for a ride you'll never forget. Because up here... the real danger isn't the turbulence. It's each other. A white-knuckle survival thriller from the author of Frozen Clues and Scalpel Truths, Altitude will keep you guessing until the final descent.