Sance on a Wet Afternoon - Mark McShane

Hoping for notoriety, a struggling psychic kidnaps a child in this Edgar Award-nominated mystery.
Most so-called psychics disgust Myra Savage. She has no patience for their chintz and cheap tricks, for her power is real. Myra can see into other people's minds, can even sometimes sense the future, but she has never yet communicated with the other side. For that she needs the cooperation of great psychics, but she lacks the stature to attract their attention. To satisfy this burning need for fame, she and her husband concoct The Plan. Bill snatches a six-year-old girl from her schoolyard and pastes together a letter demanding ransom. After a few days of citywide panic, Myra will lead the police to the girl and the money, and all of London will know her name. When a criminal can see the future, what could possibly go wrong?