Marigaby is a medical student by day—and by night, she saves lives with her family in Mexico City's high-stakes business of private ambulances. As pressure from both worlds threatens to drag her down, Marigaby will do whatever it takes to stay afloat.

Lucila leaves Mexico with her younger brother to reunite with their mother in Madrid, who had left a few years earlier to chase a better future. When they finally arrive, the bitter, suffocating reality that awaits them proves far harsher than Lucila had imagined. Still, she is determined to make the most of this fragile new life.