Petros Eleftheriadis, a homicide department detective, has just submitted his resignation to the service and is now ready for a new beginning. However, before he leaves, he takes on one last case, involving a body positioned like Da Vinci's Vitruvian Man, which bears a strange tattoo on its chest and holds a poem with numbers at the beginning of each stanza. The detective quickly realizes that this is not a simple homicide case. In his attempt to solve the crime, he is led to a story that begins twenty years ago in Thessaloniki, where a psychology student helps a girl escape from her maniacal pursuer. As the hours pass, Eleftheriadis discovers clues and events that will change his life faster than he had planned. An exciting crime thriller with mathematical puzzles, an evocative atmosphere, and a fast-paced rhythm, where the present alternates with the past, while the reader is constantly faced with successive surprises.