Some secrets aren't meant to be kept... When Grace returns to Abi's life, years after they fell out at university, Abi can't help but feel uneasy. Years ago, Grace's friendship was all-consuming and exhausting. Now happily married, Abi's built a new life for herself and put those days behind her. And yet as Grace slips back into her life with all the lethal charm she had before, Abi finds herself falling back under her spell... Abi's husband, Rohan, can't help but be concerned as his wife's behaviour changes. As their happy home threatens to fall apart, he realises that there's something deeply unnerving about Grace. Just what influence does this woman have over his wife, and why has she come back now?