Costello plays a plumber who receives a very unusual late night phone call. Some lady wants him to show up to a hotel dressed in nice clothes--not his usual overalls he'd wear to fix some plumbing. Once there, however, he realizes that some diamond thieves need his help and they're gonna get or else! So, the plumber tries delaying and then escaping when the crooks all fall asleep. When this doesn't work, he tries something else...none of which is funny in the least. This is pretty sad as it's one of Costello's last performances, as he'd die the following year...still a relatively young man in his early 50s.