An engaged couple, Caleb and Malory (Rutherford and Lapkus) forced to visit Palm Springs for a weekend to celebrate her parents' 25th wedding vow renewal and discover the apparent secret to their happy marriage - threesomes. Determined to properly celebrate their own "re-engagement," they set out on a wild night in search of a threesome of their own but the experience takes an intense turn, exposing deeper relationship problems and threatening their future together.