When the corpse of a diamond smuggler is stolen from a graveyard, Five-0 tracks down his partner, Voss (guest star 'American Idol' winner Phillip Phillips), who will stop at nothing to retrieve their latest batch of contraband. Also, Adam recruits a new confidential informant, Jessie Nomura (Christine Ko); Tani gets a devastating call; and McGarrett tasks Pua to find his and Danny's stolen tools. (TV-14 V)