 Honare Vashon orders a hit on McGarrett to avenge the death of Chris Vashon. McGarrett first receives an anonymous message intended to let him know his days are numbered. Then, Vashon hires a local killer. That attempt is unsuccessful and the killer is liquidated by the Vashons. Honare Vashon manages to evade intense surveillance long enough to hire another killer, this time imported from outside Hawaii. McGarrett knows another attempt on his life will occur. Can Five-O stop it?