Ruby Redfort feel the fear

<p>Ruby Redfort: supercool secret agent, code-cracker and thirteen-year-old genius</p> <p>The fourth book in the scarily awesome Ruby Redfort series, by multi-million-copy bestselling author Lauren Child.</p> <p>This time Ruby must pit her wits against a seemingly invisible foe. How do you set your sights on catching a light-fingered villain if you canâe(tm)t even see himâe¦?</p>