
CBS books a new version of the classic "Hawaii Five-0" series, with Alex O'Loughlin in the lead role as Detective Steve McGarrett and Scott Caan portraying Danno. The detectives are part of an elite task force whose mission is to eliminate crime on the beaches of the Aloha State. Assisting McGarrett and Danno are Capt. Lou Grover, who formerly headed Hawaii's SWAT unit; Jerry Ortega, the islands' local conspiracy theorist; and Tani Rey, a bold, recent police academy graduate. The brash unit spar and jest among themselves but remain determined to eliminate the seedy elements from the nation's 50th state.

A double homicide occurs that involves infidelity; McGarrett and the team share disastrous Valentine's Day experiences.

Danny's mom is questioned by the FBI; McGarrett works with a young, autistic man who might be able to help solve a murder.

McGarrett turns to Odell Martin (Michael Imperioli) for help when a confidential informant is accused of murder.

A Russian spy steals a flash drive containing classified information that puts a Five-0 member at risk; McGarrett learns why Catherine left; Abby keeps her mission a secret.