The thing about being a burglar is it's a secret best kept to yourself. Bernie Rhodenbarr discovers that his dentist knows he's a burglar and it seems that Dr. Sheldrake needs a burglar to steal back some valuable diamonds form his soon-to-be-ex-wife, Crystal. Bernie's visit to the Sheldrake home is thwarted by a visitor, so he hides in the closet. When Bernie emerges he finds Crystal lying dead on the floor--a dental instrument the apparent murder weapon--and the diamonds gone.