Helen’s idyllic life begins to change the day she attends her first prenatal class and meets Rachel, an unpredictable single mother-to-be. Rachel doesn’t seem very maternal, but Helen is still drawn to her. She makes Helen laugh, invites her confidences and distracts her from her fears. But her increasingly erratic behavior is unsettling. And Helen is not the only one who’s noticed. Her friends and family begin to suspect that her strange new friend may be linked to their shared history in unexpected ways. When Rachel threatens to expose a past crime that could destroy all of their lives, it becomes clear that there are more than a few secrets laying beneath the broad-leaved trees and warm lamplight of Greenwich Park.