Barnaby looks into an arson investigator who might be involved in setting fires. However, his compassion for his friend might blind him.

J.R. is in over his head when he visits Hawaii to help a friend — and ends up under arrest for drug smuggling and murder. But when Barnaby (Buddy Ebsen) and Betty (Lee Meriwether) fly to the island, it turns out that Barnaby may be the real target.