Killer at Sea

Nightmare in Blue is the 23rd episode of Season 6 in the original version of Hawaii Five-O

Synopsis
Five-O matches wits with a brilliant thief who's a master of disguise and able to manufacture his own pass keys to Honolulu hotels. The thief has information on guests with valuables and how they try to hide them in their rooms. He even calls the police while disguised as a priest claiming to be robbed himself. His motive is the sheer excitement of stealing! The question is whether McGarrett & Co. can catch up to the thief?