a mathematician and scientist with synesthesia - the special gift of auditory and sensory hallucinations linked to memory retrieval, cassandra is a rare case with which all five of her senses can be connected to her memories at any given time. her synesthesia is originally supposed to be caused by a brain tumor, described as being the size of a grape. it is lethal, but it is under control at the beginning of the series. she was invited to interview for the position of librarian 10 years ago (when flynn was successful), but was in the hospital at that time. she was a "librarian-in-training", working alongside ezekiel jones and jacob stone, from the end of the pilot until being promoted at the end of the season.
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