Set off the femme-fatale sirens, because Rachel Weisz is here to wreak havoc. Weisz stars in the mystery-thriller Complete Unknown, which follows a woman (Weisz) who reappears in the life of former lover (Michael Shannon) at a friend’s birthday party 15 years after she mysteriously disappeared. This time, though, she has a completely new life, and it turns out she has a penchant for frequently uprooting and changing her identity whenever she wants. Will he fall for her allure again? Will they disappear together this time around? Somewhere, Rita Hayworth is smiling from the grave. It’ll be released on August 26.