Danes (Terminator 3: Rise of the Machines) and Gere will play American Federal agents who must track down a missing girl who could be connected to a paroled sex offender who is under investigation.
Filming for The Flock is set to begin on October 10.
Danes can next be seen in the film Shopgirl with Steve Martin in October. She also stars in The Family Stone with Diane Keaton, Rachel McAdams and Sarah Jessica Parker in November.