Zero break refers to the deep-water location where waves first begin, often far offshore. For Honolulu homicide detective and surfer Kimo Kanapa'aka, it means his most dangerous case yet.

A young mother is murdered in what appears to be a home invasion robbery, leaving behind a complex skein of family and business relationships, and Kimo and his detective partner Ray Donne must navigate deadly waters to uncover the true motive behind her death.

Kimo is also in trouble at home, as he and fire investigator Mike Riccardi plumb the limits of their love for one another and consider the future of their relationship.