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.

When the CEO of a hugely successful surf company is murdered, Kono revisits her past while Five-0 is thrown headlong into the varied but interconnected worlds of North Shore surfing.