'The Zookeeper's Wife' Trailer: Jessica Chastain Tries to Save Warsaw Ghetto in WWII

"You can never tell who your enemies are or who to trust. Maybe that's why I love animals so much — you look in their eyes, and you know exactly what's in their hearts."

Jessica Chastain is a World War II heroine in the trailer for The Zookeeper's Wife.

The historical drama tells the real-life story of Antonina Zabinska, a working wife and mother, who, in 1939 Poland, cared for the Warsaw Zoo with her husband, Dr. Jan Zabinski (Johan Heldenbergh). But when their country is invaded by the Nazis, the two are forced to report to the Reich's newly appointed chief zoologist but covertly begin working with the Resistance to save lives out of what has become the Warsaw Ghetto.

Niki Caro directed from a script by Angela Workman, based on the nonfiction book by Diane Ackerman. Daniel Bruhl and Michael McElhatton are also featured in the cast.

Focus Features will release The Zookeeper's Wife on March 31.