In this intense crime-thriller, Inspector Ace is drawn into a dangerous game of cat-and-mouse with a mastermind killer. After a series of murders marked by four-leaf clover symbols, Ace, along with his top student Rosa, uncovers clues pointing to a deadly pattern connected to the four suits of playing cards. As the investigation deepens, Ace's past resurfaces, revealing betrayal and unfinished business with former friends Oliver, Max, and Cloudine, who were all part of an illegal experiment. The killer's true motive unfolds in a shocking twist, putting everyone's lives on the line as they race to outwit their enemy before the final crime.