A Perfect Murder is perfectly good thriller. Not super amazing, but taut and engaging and it doesn't veer into any kind of nonsense toward the end.
Michael Douglas plays a successful hedge fund wall street type, married to a wealthy younger woman played by Gwyneth Paltrow. He discovers she is having an affair, and also learns that her lover has a history of seducing heiresses for their money. He decides to pay the lover a large sum of money to murder his wife and disappear. He has a perfectly planned burlary scenario. Which of course goes wrong. It gets pretty interesting, as the the burglar turns out not to be the lover and the lover tries to blackmail Michael Douglas. Gwyneth Paltrow is kind of vague and dim throughout, but eventually begins to suspect her husband.