Beyond Suspicion (1993)

A web of deceit, lies and sex sends a woman on a risky mission to catch a deranged killer in this tightly wound thriller. Two decades of brutal and mysterious murders have gone unsolved as a concerned wife begins to suspect that her seemingly mild mannered husband could be responsible. The key to trapping the unlikely maniac lies deep in the man's bizarre and twisted psyche: his greatest sexual turn on is actually talking about his victims. Now, can his wife manage to seduce her husband while getting him to admit his crimes on tape?