She's ready to serve. Even if it means heading straight into danger. England, 1940. Shedding a tear as she says goodbye to her new fiance when he leaves to fight, Lily Baker begins her own journey in the ATS. Thrilled after she wins the assignment to work in a coveted post, Lily is shocked to find out that one of her new colleagues might be a spy. And when she learns that her beloved is missing in action, she vows to do all she can to protect those around her.