"In this case, I guess you're talking about clues deliberately sent by the killer, not those inadvertently left at crime scenes?" Malcolm asks. He loves getting to talk about serial killer stuff, so hopefully Max is prepared for an earful.

"Sometimes killers send letters because they do have a secret subconscious desire to get caught. That wasn't the case with the Zodiac. His letters were to prove how smart he was, smarter than anyone else. That's why they were in code. Other killers send more straightforward letters.

The BTK killer basically got himself caught by initiating correspondence with the media and police thirteen years after his last victim. Why?" Malcolm shrugs. "Mostly taunting. He thought it was a game and was upset when the police lied to him and used data on a floppy disc that he sent to catch him. He's a classic narcissist though. He loved that attention."

Malcolm makes a face. BTK reminds him too much of his father, so he has a special hatred for him.

"She did..." he agrees absently as he starts to write the block of letters out into meaningful words and sentences. There are an awful lot of hearts in this letter...

Is it possible?