When Australian expat Simone moves to London to start a career, getting pregnant is not on her agenda. But she's excited to start a new life with her baby and determined to be a good mother. Even though her boyfriend Paul's cold and grey apartment in the Barbican Estate seems completely ill-suited for a baby. Even though Simone and Paul have only known each other for a year. Even though she feels utterly unprepared for motherhood. The arrival of Paul's cousin Rachel in the flat should be a godsend. But there is something about Rachel that Simone doesn't trust. Fighting sleep deprivation and a rising sense of unease, she begins to question Rachel's motives, and to wonder what secrets the cousins share.