"An exhilarating and accomplished action-packed thriller."—B. A. Paris Her best friend is dead. Emma and Ariella, neighbours in one of Sydney’s most exclusive suburbs, appear to have it all—perfect homes, perfect husbands, perfect lives. But they both know dark secrets lurk beneath the surface and shallow waters can’t hide Ariella’s. Now she has been found murdered. Her daughter filmed the killing. Not knowing what she’s filmed, Emma’s daughter Kiki innocently uploads footage of Ariella’s brutal death. Emma fears the worst—the killer will know what she and Kiki have seen. Their safe suburban lives no longer exist.