Dating is hard, exceptionally so for Hawaii Five-0's Danny Williams.

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The detective will plan a nice romantic getaway during "Nānahu (Embers)," but it will go horribly awry when Amber's ex-husband enters the scene. It will go so badly, in fact, that Danno will need to call in the big guns.

"Poor Detective Sergeant Williams," TV Line teased. "Love never comes easy for him, especially when an upcoming romantic getaway goes awry, and Steve needs to ride to his brah's rescue."

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While TV Line makes it sound like the Five-0 investigator will hit a little sanfu, Entertainment Weekly elaborated on just how dangerous Amber's abusive ex can be.

"Per usual, Danno's love life is going to get even more complicated when his girlfriend Amber's crazy, abusive ex-husband (David Hoflin) shows up hoping to win her back," teased Entertainment Weekly. "Let's just say things will get very violent and very bloody."

Although McGarrett will eventually have to drop by Danno's botched date, the former Navy SEAL will spend most of the episode teaming up with CSI: New York's Melina Kanakaredes. Young couples are being picked off by a deadly arsonist, and Kanakaredes' ATF agent will help Five-0 track down the killer.

Scroll through the photos above and check out the video below to get a glimpse at "Nānahu (Embers)."

Find out more when Hawaii Five-0 airs Fridays at 9 p.m. ET on CBS.