As the plague decimates London in 1665 and an assassin threatens the apothecary's life, apprentice Christopher Rowe and his faithful friend Tom, following a trail of puzzles, riddles, and secrets, risk their lives to untangle the heart of a dark conspiracy.
School Library Journal starred, October 2016 Kirkus Starred, July 2016 Horn Book, April 2017 Voice of Youth Advocates (V.O.Y.A.), October 2016 School Library Journal starred Kirkus Starred Horn Book
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