Jumpers — Christopher G. Moore

Calvino investigates the death of a friend, a Canadian painter. The medical examiner finds the young man has ingested an exit drug, and the police verdict of suicide seems justified. But in Bangkok appearances have a habit of deceiving. Sometimes jumpers are given a leg up in their leap to the next life. Fingering the helper can be a risky business, and for Calvino this promises to be one of those times.