How do you catch a thief who isn't there? Ruby discovers the perils of throwing caution to the wind as she embarks on her fourth adventure. Ruby Redfort has a lot of reasons to feel confident. Undercover agent, code cracker, thirteen-year-old genius -- she's one fearless kid, buster. Unmasking an evil villain? Done. Honing her parkour skills by climbing skyscrapers and leaping across roofs? All in a day's work. Heeding the warning signs? Well, not...