Hobbes starts trailing his ex-wife, and gets arrested as a stalker. Hobbes believes his ex-wife Vivian's new fiance is a crook. Darien thinks he's jealous, but it turns out Hobbes is right, and they're assigned to the case. It turns out that the fiance is an undercover agent for Naval Investigations. They all team up to find the culprit in an illegal arms sale. They get captured but Darien manages to escape with his invisibility, and capture the bad guys. Hobbes is impressed with the fiance, Brock, and reconciles with Vivian.
