Cora is a happily-married woman with a child. They're living together in a nice little house and look like a completely normal couple. But one day, she stabs a complete stranger to death in the middle of a beach without even trying to hide it from the authorities. Cora has absolutely no idea why she did that; yet, she is forced to deal with the consequences. Countless folks on the beach that day saw her murder that poor person, which means no lawyer out there will be able to exonerate the killer. So, the woman and her husband team up with a detective to get to the very bottom of this. She needs to remember exactly what happened; otherwise, she'll spend the rest of her life behind bars.