Feel the fear

Five months have passed since 13-year-old Ruby Redfort joined Spectrum as a field agent, and in her fourth adventure, she gets even more physically daring, as she parkours around Twinford solving mysteries. Opening with Ruby seated on the windowsill of the seventy-second story of a skyscraper, the story will delight readers as Ruby tries to catch a thief. But her efforts are mental as well as physical, and Traille, the ternary touch code Ruby must crack, is beautifully described in an appendix. Fans will happily greet the usual cast of marvelous supporting characters and rejoice at Ruby's return.--Carton, Debbie Copyright 2016 Booklist