CIA agent Mason 'Mace' Brown joins forces with a rival German agent, a cutting-edge computer specialist and a Colombian psychologist when a top-secret weapon falls into the hands of a group of mercenaries. Together, the four women embark on a breakneck mission to save the world while staying one step ahead of a mysterious figure who's tracking their every move.

Set in the early 1960s, best friends and neighbors Alice and Celine both live an idyllic traditional lifestyle, but life's perfect harmony is suddenly shattered after a tragic accident. Guilt, suspicion and paranoia unravel their sisterly bond and a psychological battle begins.