Looking for a story where Shawn becomes a Real Psychic

Hi

I'm looking for a fic i read awhile ago. I think it is a Shassie fic. In the fic Shawn suddenly gets real psychic powers. I think he meets  strange woman who tells him that things are going to change.  Suddenly when he touches objects he gets psychic flashes. He has a hard time dealing with them but he uses them to help solve a case involving a series of murders. I think he goes to a convention for psychics and gets kidnapped by a serial killer who likes to kill people at conventions. Shawn and Lassiter set him up as bait and Shawn gets captured,