A new ally helps McGarrett and Five-0 when mob bosses on the island are being targeted by an assassin. Also, Five-0 says goodbye to one of their own, on the 10th season premiere of HAWAII FIVE-0, Friday, September 27th at its new time on CBS. Katrina Law joins the cast as Quinn Liu. Rob Morrow guest stars. Subscribe for more Hawaii Five-0 season 10 promos in HD! Hawaii Five-0 official website: Like Hawaii Five-0 on Facebook: F
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