Why did Adam find bone fragments at his new construction site?
Meanwhile, McGarrett investigated the murder of one of the last survivors of the USS Arizona.
This paved the way for him to learn more about his grandfather's important role at Pearl Harbor.
Use the video above to watch Hawaii Five-0 online to get caught up with the latest drama for the characters on this hit CBS drama.
Paul Dailly is a staff writer for TV Fanatic. Follow him on Twitter.