In 1928, aboard the Cap Polonio—a lavish transatlantic cruise ship bound for Buenos Aires—Max Costa locks eyes with Mecha Inzunza across the first-class ballroom. They are an unlikely match. He is a thief, sleek and refined, hired to dance with unaccompanied passengers. She is the elegant wife of an accomplished composer, accustomed only to luxury. But as they embrace in a fiery tango, a steamy and dangerous love affair ignites—following them from the ship’s gentle sways in the Atlantic night to the seedy decadence of Buenos Aires. Yet as quickly as their affair begins, the two lovers are torn apart.

In Nice, 1937, Max and Mecha’s lives intersect for a second time and they rekindle their dalliance with ease. But in the wake of a perilous mission gone awry, Mecha looks after her charming paramour until a deadly encounter with a Spanish spy forces Max to flee.

Decades later in Sorrento at the height of the Cold War, Max once again runs into trouble—and Mecha. Their attraction is undeniable but with KGB agents on Max’s trail, the small glimmer of hope is becoming increasingly dim.