Thirteen-year-old Ruby, a genius code-cracker and daring detective, gets an anonymous call setting a challenge that leads her to the headquarters of Spectrum, a

"Sardonic narration will grab readers from the get-go, and puzzles laced throughout will intrigue those who share Ruby’s passion for solving mysteries." — P

Got a sixth sense for trouble? Read on, buster. Our favorite girl detective calls on her gut instincts in an exciting grand finale of the Ruby Redfort series. R

Originally published: London, England: HarperCollins Children's Books, 2015.

Ruby Redfort: Undercover agent, code-cracker and thirteen-year-old genius – there’s nothing average about her. Only this time it’s an adventure in the wil