Following the violent abduction of an ex-NSA cyber-terrorism expert in the middle of downtown Waikiki, Five-0 must race to rescue the man, and prevent a breach of national security.

Five-0 is tasked with tracking down a violent convict after he breaks from an Island prison in search of his stolen money and kidnaps a young couple on vacation in Waikiki. Meanwhile, McGarrett's estranged sister, Mary, arrives from the mainland.