That mysterious third Olsen sister is set to become a little less mysterious.

Elizabeth Olsen, who garnered rave reviews at the Sundance Film Festival for her performance in the indie 'Martha Marcy May Marlene,' will star opposite Dakota Fanning in 'Very Good Girls,' Deadline reports.
Martha Marcy May Marlene
Based on 38 critics

A woman (Elizabeth Olsen) struggles to reintegrate into society after fleeing from a cult. Read More

An Education
Based on 34 critics

In 1960s London a teen (Carey Mulligan) falls under the spell of a charming, but much older, suitor. Read More