Superspecial is the final book in The 39 Clues series. It consists of one book, Outbreak by C. Alexander London.

Book: Outbreak

The book will see the Cahills investigate Sinead Starling, who had once been a family traitor.


The book sees the Ekaterina base in the Bermuda Triangle destroyed, as well as an goat pox virus modeling tarantism (a virus outbreak in historical Italy that made an entire region dance without a reason). The book also sees the organization Sinead worked for, “ShkrellX Pharmaceuticals”, attempt to take the created cure for the “beat pox” virus, as virus creator Dr. Miller stated he he liked to call it.

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