She thought he was neurotic. He thought she was psychotic. The Navy thought they were the perfect pair.

Shelby Ryder is a loose cannon. A Kansas farm girl, she became a Navy SEAL to avenge her parents, who were killed on vacation when a Russian sub torpedoed their catamaran. Earl Bernstein, from Chicago, became a SEAL to get away from his over-protective parents. Earl’s the sensitive type. He writes poetry and worries about his teeth enamel eroding.

The Navy thought by pairing them together they would balance each other out. They were wrong.

After brushes with the law and staying just this side of sanity, Shelby and Earl are on the verge of being de-SEALed. Now they’ve been given one last chance to redeem themselves.

It’s a simple enough mission: they’re tasked with finding a United States senator who disappeared in Cuba while playing golf. But then one day the president tweets that the Russians are responsible, and things get perilous in a hurry. Soon it becomes clear—if Shelby and Earl don’t get the senator back, the situation will escalate into a nuclear war. So into the steamy Cuban jungles filled with snakes, spies and a German tuba band, the pair ventures, breaking every rule of civilized behavior known to man as they desperately try to find the senator before the missiles fly or Earl runs out of anti-cavity rinse.