Fans will happily greet the usual cast of marvelous supporting characters and rejoice at Ruby’s return.
—Booklist Online
Ruby Redfort is a 13-year-old undercover agent, genius code-cracker, and brilliant detective who works for Spectrum, a secret crime-busting organization…Actual puzzles and codes created by a noted mathematician make this novel a good choice for older STEM collections and teaching units. Notes on Braille, Parkour, and the ability to move around one’s environment without limitations are an added touch and help create a story of great interest for boys and girls!
—School Library Connection