When evidence to put away a drug kingpin is stolen, Lucy goes undercover at an underground poker tournament to find out which high roller is behind the crime; Lucy's feelings are in turmoil when Whistler's ex-girlfriend arrives in town.
A successful surf company's CEO is murdered, and Kono revisits her past. Meanwhile, the team dive into the world of North Shore surfing.
The team struggles to identify a suspect, when a company that endangers sharks is threatened; Kamekona tries to earn his helicopter license.