Honore Vashon, in prison for three years after Five-O brought down his crime family, is seeking parole. McGarrett & Co. turn up evidence that Vashon still is active in controlling the Vashon family rackets despite being in prison, crushing his parole bid. Now, Vashon is determined to get revenge on McGarrett for the death of Vashon's son Chris three years earlier. The crime boss takes a delegation of visiting officials hostage, threatening to kill them unless McGarrett comes inside the prison.
—Bill Koenig