Your baby died in your sister's care -- the police think it's murder but she insists she's innocent. Who should you believe? The unthinkable has happened to Martha. She thought her baby daughter would be safe with her sister Becky while she was called away with work. Becky might be more relaxed than Martha, but she's a good parent to her own son. But the news of her baby's death and, later, her own sister's arrest turns her whole world upside down. Martha will have to watch her sister stand trial, to hear the evidence build up piece by piece. Her husband is sure of Becky's guilt. But Martha loves her sister, she knows her sister. Doesn't she?