It's Lex's first day back at work after maternity leave. She worries about the separation from her daughter as she leaves her with the nanny - but it's normal to worry, right? But Lex isn't a 'normal' mother. She's an elite-trained killer who works for a covert department within Her Majesty's Secret Service. She's just been given the assignment of her life, but can she juggle motherhood with the life of an assassin?