Meet Caroline Gray: divorcee and newly-single mother. Firmly closing the door on her acrimonious divorce, Caroline and son Ben have moved to trendy Frencham where they join Caroline's long-time best friends, Heather and Eva. Settling into their new life is easy, but nothing has prepared Caroline for the demands of motherhood at The Sycamore, the school the trio's beloved offspring attend. Forget classroom bullies, forget trips to the head's office, this is full-scale adult playground politics. This is battle with the mothers who won't take no for an answer -- the Playground Mafia.

Amidst the four-wheel drives, Ben's complicated afterschool play-date schedule and her friends' perilous extra-marital affairs, Caroline tries to keep a low and very single profile. But it's not long before she too finds herself under the mafia's scandal-radar, and her life takes an unexpected turn ...