THEY'RE THE BEST OF FRIENDS. OR SO THEY SAY... 'Brilliant: so funny, so sad, so scary' Jacqueline Wilson 'It will resonate for all women, and it's so much fun' Marian Keyes 'Part whodunnit, part dark take-down of motherhood' Gillian McAllister 'Compelling, thought-provoking, unputdownable' Sarah Turner 'Universally empowering' Kate Sawyer An intense heatwave. A high-stakes baby shower....