Why was a serial killer targeting couples in love?
That's what Lucifer and Chloe aimed to find out on Lucifer Season 3 Episode 18 when it became apparent that someone was mad.
After some digging, Pierce realized the case was connected to one he solved back in 1958.
Meanwhile, Lucifer grew frustrated with Pierce when he flipped on a decision he was going to make about the case.
Was their friendship doomed?
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Paul Dailly is a staff writer for TV Fanatic. Follow him on Twitter.