The Protege Description:

Anna is an assassin raised by Moody after he discovered her in the aftermath of a massacre in Da Nang, where she killed four men who had kidnapped her and murdered her family. For years, they traversed the globe and completed high-profile contracts-settling in England where she runs a rare-book store and he lives in a manor house. She first encounters Rembrandt in her store when he comes in on the pretext of buying a gift.