A man with a hook for a hand escapes from a mental institution to go after the children of his previous victims.
In a smoke-filled dive in Buffalo, NY, David Marx tells us his tale of obsession, betrayal, and murder - leading him to an uncertain fate "underneath Niagara Falls." David tells us how his beautiful redheaded ex-girlfriend, Jennifer Barnes, has disappeared and how he ended up the guardian of the 2.5 million dollars that "was supposed to have bought Jen's safety."
Steve McGarrett returns home to Oahu, in order to find his father's killer. The governor offers him the chance to run his own task force (Five-0). Steve's team is joined by Chin Ho Kelly, Danny "Danno" Williams, and Kono Kalakaua.
