Five-0 must work with charming con man Hank Weber to find a killer when his female partner is murdered on the job. Also, San Francisco Police Inspector Abby Dunn comes to O'ahu and works with Chin to investigate the murders of five Chinese arms dealers.

It's fight night on O'ahu! Five-0 investigates when the brother of the promising local boxer is murdered and the prime suspect is the outspoken reigning champion opponent from the mainland.