As former NSA, Dayton "Day" Ingram has national security chops and now works as a technical analyst for Scorpion. He longs for fieldwork and scuttling an attack gives him his chance. He’s smart, multilingual, and a technological wizard. But his opportunity comes with a hitch. His partner, Knighton, "Knight", is a real mystery. Despite countless hours of research, Day can find nothing on the agent including his first name.
A former Marine, Knight crawled into a bottle after losing his family. After drying out, he’s offered one last chance: along with Day, to stop a terrorist threat from the Yucatan. To get there without drawing suspicion, Day and Knight board a gay cruise, where the deeply closeted Day and equally closeted Knight must pose as a couple. Tensions run high as Knight communicates very little, and Day bristles at Knight’s heavy-handed need for control.
But after drinking too much, Day and Knight wake up in bed together. As they near their destination, they must infiltrate the terrorist camp and neutralize a plot aimed at America's technological infrastructure. If they hope to have a life after the mission, one that might include each other, they must learn to trust and rely on each other.