Amanda Reeves, the adult daughter of U.S. Ambassador to the Philippines Michael Reeves, is found drowned. Governor Jameson takes a personal pledge to find those responsible, and enlists Five-0. Over the course of the investigation, they learn Amanda's sister Robyn is still alive and was last found in a nightclub. McGarrett and Danny discover somebody drugged both sisters and sold them to a sex trafficking ring. The Five-0 team storms the operation, but they find that Robyn is not there. They learn from the head of the operation that they were ordered to kidnap the sisters from a Filipino terrorist organization, headed by Carlos Bagoyo (Patrick Gallagher), who is using the ransom demand to get to Reeves and log in to a database. Five-0 storms the warehouse after confirming Robyn is present, and McGarrett subdues Bagoyo. Meanwhile, Mary finds her father's tool box that he left for her brother to solve a crime, and starts investigating herself. This episode introduces quirky medical examiner Max Bergman (Masi Oka).