The Top Twenty Bestsellerwaterstones Thriller Of The Month'if You Like Louise Candlish, Then You'll Want To Take A Walk In Greenwich Park' Red'a Twisty, Fast-paced Read' Sunday Times'the Perfect Thriller' Caz Frearhelen Has It All.daniel Is The Perfect Husband.rory Is The Perfect Brother.serena Is The Perfect Sister-in-law.and Rachel? Rachel Is The Perfect Nightmare.when Helen, Finally Pregnant After Years Of Tragedy, Attends Her First Antenatal Class, She Is Expecting Her Loving Architect Husband To Arrive Soon After, Along With Her Confident, Charming Brother Rory And His Pregnant Wife, The Effortlessly Beautiful Serena. What She Is Not Expecting Is Rachel.extroverted, Brash, Unsettling Single Mother-to-be Rachel, Who Just Wants To Be Helen's Friend.