Heavily pregnant with her second child, Tessa Irons has enough on her mind without her toddler throwing tantrums at the local coffee shop. The boy is inconsolable, shouting “Gigi!” to a woman Tessa’s never seen before—and never will again. The next morning, the woman’s body is dredged up from the canal outside the Ironses’ posh Venice Beach home, and Tessa’s gut tells her it’s no coincidence.

Barb Geller refuses to believe that her daughter’s death was just some drunken accident. She heads to California for answers, where she crosses paths with Tessa. Together they hunt for the truth, certain they’ll find a connection between their children.

But the police don’t believe them. Tessa’s husband dismisses her worries as pregnancy jitters, and even though people are always watching along the Canals, no one saw a thing. Tessa and Barb only have each other, their intuition, and the creeping sense of danger that grows with every shocking revelation.