Brit TV producer Fallon takes careful what you wish for to hilarious heights in her debut novel, a comedy of errors triggered by a mistress who discovers thrice-weekly hookups with her married lover are better than a 24/7 relationship with him. Helen, office staffer at a public relations firm catering to desperate D-list celebrities, is fast approaching her 40th birthday with little chance of swimming out of the secretary pool or snagging a full-time commitment from Matthew, her middle-aged lover and relay relationshipper. When Matthew abruptly leaves wife Sophie and preteen daughters Suzanne and Claudia to move in with Helen, she's not sure it's the happy ending she prefers. Thus begins a head-spinning ruse to convince Matthew to go back home and to persuade Sophie and her scene-stealing pair of potty-mouthed children to take him back: Helen invents a new persona, hard-charging PR whiz Eleanor, who befriends Sophie and gives her advice to repair her shattered marriage. The scheme gets more elaborate when Helen/Eleanor falls for Matthew's estranged eldest son. This delightfully fizzy chick lit caper goes disappointingly flat before the finish, but the surprising and rewarding treat is a bright, grown-up story of two women who discover friendship and trust in one another.