On a dark and snowy night in London, a renowned private detective finds himself caught up in an intriguing and dangerous adventure. His mission: to protect a newly acquired valuable object, a legendary diamond known as the "Heart of Egypt." The jewel has attracted the greed of several intriguing characters, each with their own hidden agenda. As they travel on a luxurious train filled with eccentric passengers, a series of mysterious murders begin to unfold, leaving everyone on edge and in a state of paranoia.
The detective, surrounded by a group of travelers as varied as an aristocrat and a jazz singer, must race against the clock to untangle a web of deceit. Each passenger is a potential suspect, and each seems to harbor secrets that could cost lives. Amidst the rising tension, the detective uses his wit and a series of cryptic clues to piece together loose ends of the plot and uncover the truth behind the murders.
As the lights flicker and the train moves through the night, the atmosphere becomes even more claustrophobic, turning the passengers into a group of suspects facing a deadly game of cat and mouse. With unexpected twists and a suspenseful climax, the final revelations will leave everyone speechless, and the detective will have to confront not only the murderer but also his own fears.