Jamie's conduct is questioned when a suspect he was pursuing is fatally injured; Baez goes under cover to investigate a drug dealer -- the fiance of Danny's ex-girlfriend (Charisma Carpenter).
The team search the jungle for the missing witness in a high-profile murder case, and strives to find her before the assassins can.
The team investigates the murder of a wealthy restaurant owner; McGarrett must take part in a charity MMA fight; NCIS Agent Kensi Blye offers her expertise.
When the head of a major crime family is killed, Five-0 enlist the help of an old friend, and inadvertently trigger a series of revenge murders.
Liz is perplexed by never having heard of Leap Day Williams, but her day gets a whole lot stranger when she bumps into an old college friend.