⚠️ Mature content ahead. This story includes violence, blood, crime-related scenes, and dark themes that may not be suitable for all readers. Eric Johnson is a senior FBI agent with a record of cases no one else could close, shadows under his eyes that never fade, and a partner named Scarlet who steals his cigarettes and stays in his hospital rooms longer than anyone should. He doesn't call it love. He calls it protection. Because the last woman who loved him ended up in a grave. When a series of mob killings starts leaving playing cards in the victims' mouths-queen of spades, then king of hearts-Eric finds himself trapped in a game he didn't know he was playing. The killer calls herself the Queen of Spades. She calls him the Suicide King. She knows about his mother. She knows about the family that threw him away. And she knows about Scarlet. "The queen of hearts," she whispers through hidden speakers, "is the most dangerous card of all."