Danny gets a phone call from his mother about his sister. He calls the sister after his mother tells him his sister is pregnant . That he can handle . But can he handle it when he finds out who the father is . This time he may pull the trigger .

She could hold her breath longer and swim farther than the average person; never would she have guessed that these skills would come in handy being a cop.

A case vital to Hawaii's economy is interrupted by the worst weather in 30 years. Look for tailing, rescues, banter, food, a little h/c and lots of danger with the brilliant detective, clever lieutenant, undercover superstar and action hero. Now the storm is causing real trouble on Oahu and the Five-0 team has to pitch in to help, without forgetting about their case.

He couldn't remember his name, where he was or even the date. His mind was a huge blank, and everything and everyone around him were strangers.

The Five-0 team needs each other more than ever. Steve is dealing with his mom while trying to find a way to keep Danny and Grace in Hawaii. Meanwhile, Chin gets help from an unexpected source to save Kono while Malia is still in the hospital-Post 2x23.

Feeling overwhelmed by the case and Steve's continued lack of communication, agent Sam Hannah steps in to offer advice to Danny. A slighty Au epi tag to the whole small pox XO.

Steve and Kono are caught up in a real tsunami. Will they make it to higher ground in time or will they be swept away in more than one way? Steve/Kono

Steve swears she's his mom, but Danny's sixth sense…his cop sense…his Steve sense…tells him that something isn't right. Problem is, Danny may not be sticking around long enough to prove it. And their friendship may not survive this even if he does.

When a routine, though curious, murder investigation becomes personal for the Five-0 team, lines will be crossed and endurance tested in order to solve the case save one of their own.