Sinead Starling is a computer/mathematical genious, and sister to Ned and Ted Starling. In the very first book, they were in an explosion, and because of their injuries, we're taken out of the Clue Hunt. She and her brothers later appeared in Into the Guantlet '' In Cahill vs. Vesper series, Sinead was Amy's best friend and trained together in defense. During the course of the books she betrayed them, revealing herself as the mole.
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Sinead Starling
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