When the body of a young girl who was kidnapped 10 years earlier is discovered, Five-0 must hunt down the kidnappers who have now taken their next victim. Meanwhile, Kono asks Catherine for a favor that could damage her relationship with Adam.

As the CIA tasks Five-0 with finding a dangerous killer loose on the island, Kono goes on the run for a murder she did not commit. Meanwhile, McGarrett's prison visit to Wo Fat ends with a shocking discovery.