Furious has introduced Catherine (Lola Petticrew) through her kills and the manipulative strategies she's undertaken to achieve them. But in episode 4 of Elizabeth Meriwether's new crime drama, FBI agent Alice Black (Emmy Rossum) uncovers the past of this mysterious killer, including her name, the meaning of her memory box, and her motive. In "Flash Flood," a trip to a group home for children reveals the that Catherine was besotted with Isabel, who died under mysterious circumstances years ago. Catherine is on a murder-fueled quest to find out what happened, and make anyone involved with Isabel's death pay.

In an interview with Petticrew, they said of Catherine's relationship with Isabel, "She's absolutely head over heels in love with Isabel. I mean, that's her total motivation... She was totally and utterly in love with her, and she was her best friend."

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Petticrew also spoke to the meaning of the memory box, which a social worker tells Alice was encouraged to give the foster kids hope for their futures.

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