They call themselves the May Mothers?a group of new moms whose babies were born in the same month. Twice a week, they get together in Brooklyn's Prospect Park for some much-needed adult time.

When the women go out for drinks at a hip neighborhood bar, they're looking for a fun break from their daily routine. But on this hot Fourth of July night, something goes terrifyingly wrong: one of the babies is taken from his crib. Winnie, a single mom, was reluctant to leave six-week-old Midas with a babysitter, but her fellow May Mothers insisted everything would be fine. Now he is missing. What follows is a heart-pounding race to find Midas, during which secrets are exposed, marriages are tested, and friendships are destroyed.

Thirteen days. An unexpected twist.

Aimee Molloy's debut novel, The Perfect Mother, was a New York Times bestseller, and has been translated into more than twenty languages. She lives in Western Massachusetts with her family.