Steve McGarrett returns home to Oahu, in order to find his father's killer. The governor offers him the chance to run his own task force (Five-0). Steve's team is joined by Chin Ho Kelly, Danny "Danno" Williams, and Kono Kalakaua.

Follows the lives and families of three adults living and growing up in the United States of America in present and past times. As their paths cross and their life stories intertwine in curious ways, we find that several of them share the same birthday - and so much more than anyone would expect.

Seventeen year old Tanya's plans for a carefree summer are derailed when her stressed-to-the-limit mom takes off for a wellness retreat and puts Tanya and her three siblings in the charge of a crotchety (and racist) old babysitter. The babysitter’s sudden death leaves the kids short on cash and reluctant to pull mom prematurely out of her much-needed R&R, so Tanya is forced to get a job. Posing as an adult, she gets a gig as the executive assistant at a fashion company and overnight is thrust into the world of adulthood and parenting.

Two years ago, William Langston made a mistake that would affect the course of his life. Now, with a killer loose in his home town and his circle of friends falling away one at a time, William faces his greatest fears as well as his own mortality.

Marc Chung buys a pellet gun to protect his address.

Caroline changes her relationship with Richard.