When Sadie Roper moves back to London, she's determined to pick up the pieces of her shattered life by getting her daughter into an exclusive school, and then restarting her law career. Nothing goes quite as planned until Liza, queen of the school moms, befriends Sadie, and invites her into the inner circle. Soon Sadie and her family start to thrive, but does this close new friendship prevent her from seeing the truth? Sadie may be keeping her friends close, but what she doesn't know is that her enemies are closer still.