Thora Birch has joined Adrian Grenier and Mimi Rogers in the political thriller Public Affairs, Variety has learned exclusively.

Eric Bross is directing from a script by Tom Cudworth. Producers are School Pictures’ Stephen Israel (“Swimming With Sharks”) and George Voskericyan (“Helicopter Mom”) of American Film Productions. Shooting starts this month in Norfolk, Va.

13 Films has international rights to the project, which was introduced to buyers in Cannes.

“Public Affairs” follows a young campaign aide who sleeps with a presidential candidate’s wife — a mistake that sends him into a downward spiral of corruption and blackmail. He is left fighting not only for his career, but also his life.

“I’ve long-admired Thora’s raw talent and am thrilled that she has joined the team,” said Israel. “Her honesty and depth will truly complement an already-strong cast.”

Birch’s credits include “Patriot Games,” “American Beauty” and “Ghost World.” She took...