Ten years after Jack the Ripper shook British society to its core, another brutal crime hits the headlines: Amelia Dyer is arrested on suspicion of murdering over 300 infants, including her own daughter and son. However, her one surviving child, Polly Dyer may be the key to her mother’s conviction — if she can bring herself to remember the past. With the help of her friend Charlotte Cullum and renowned prosecutor Horace Avery, Polly discovers that our traditional ideas of motherhood can often hide an untamable darkness.