i hunt killers, Barry lyga, Fiction

In the last few chapters jasper is interviewed in jail. they found a note from an unknown person saying: "under no circumstances are you to go near the dent boy". the handwriting wasn't his fathers nor his. jasper asks the police to deliver a message to his father for him that he is onto his father and that he is hunting him and using everything his father ever taught him to help his hunt. He then explains that hes never killed anyone but if he gets a hold of his father that he'll kill him. Jasper then gets a tatoo in gothic writing that says "i hunt killers"