Every corpse is a clue. A woman is found murdered in a field. Tattooed on her feet is a strange combination of numbers and letters. Detective Beatrice Kaspary quickly identifies these as map co-ordinates, which lead the police to a 'treasure box' containing several severed body parts -- and a note from the killer with a series of cryptic clues to the identity of the next victim. So begins a desperate scavenger hunt in which Beatrice herself becomes a pawn in the killer's game of cat and mouse, as she risks all to uncover the murderer.