Who killed Adam's sister?
That was finally revealed on Hawaii Five-0 Season 9 Episode 9 when the officer realized a lead that had not been followed up and set out to avenge the death of his loved one.
Meanwhile, a renowned urban vigilante was murdered after making a citizen's arrested and the team had to enter the world of superheroes and comic books to locate the killer.
Who suited up?
Use the video above to watch Hawaii Five-0 online right here via TV Fanatic.
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Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.