A ring of Cuban operatives seeking to infiltrate anti-government groups exiled in Miami in the early 1990s is the focus of French director Olivier Assayas' "Wasp Network," a star-studded political thriller based on a true story.

Starring Penelope Cruz, Edgar Ramirez, Gael Garcia Bernal and Wagner Moura, the film premiered at the Venice Film Festival on Sunday, where it is competing with 20 others for the top Golden Lion prize.

The action begins in Havana with Cuban pilot Rene Gonzalez, played by Ramirez, flying off to the United States to defect, leaving his wife, Cruz' Olga, and their daughter behind in the communist state led by Fidel Castro.