As Kono (Grace Park) and Adam (Ian Anthony Dale) torture a Yakuza hitman for the name of who put a hit out on both of them, Five-0 is called in to investigate the murder of a wedding crasher and the attempted murder of a runaway bride (Lacey Beeman) on the day of her wedding. Chin Ho (Daniel Dae Kim) manages to find a connection between the two victims who were actually brother and sister wedding scam artists. Both the groom (Alex Ashbaugh) and his mother (Rebecca De Mornay) are shocked by the news of her past despite their lawyer’s (Bruce Nozick) detailed background check.
The episode also returns Autumn Reeser as Danny‘s (Scott Caan) girlfriend Gabby for an ill-advised double-date movie night with McGarrett (Alex O’Loughlin) and Catherine (Michelle Borth) for a romantic comedy that McGarrett rather loudly proclaims is neither romantic nor funny. Danny also has to decide what to do after Gabby was offered a six-month job in Denver and given McGarrett’s own questionable decision about letting Catherine work for her ex-boyfriend (Justin Bruening) he’s in no mood to take Steve’s advice on the subject (especially now that McGarrett is already second-guessing that decision).
The team not only solves both attacks but puts the now unhappy couple back on good terms for an impromptu second wedding ceremony in the hospital. The fallout from attending the wedding forces Danny to finally sit down for a heart-to-heart with his girlfriend and put a pin in their relationship at least for the foreseeable future. Although the show doesn’t state that Gabby is gone for good, it looks like Danny and Grace (Teilor Grubbs) are back on their own again.