Secret Scouts is a new fact-fiction children’s book series about historical fact, friendship, mystery and adventure! When best friends Tom, Lisa, Sophie and Jack stumble upon a mysterious sketch that has all the hallmarks of an Old Master, they decide to investigate. Soon they discover an original 15th century codex full of Leonardo da Vinci’s sketches, writings and calculations. From a family of modest means, Jack and Tom see the codex as a fast track to wealth and fame. Sophie and her sister Lisa, however, have other plans. They decode the codex and discover an incredible secret: Leonardo da Vinci’s invention of time travel. Their discovery tests their friendship and presents them with an impossible choice: reveal their secret to the world – and become millionaires – or put da Vinci’s extraordinary ideas to the test, risking their lives for a walk on the wild side. Their journey brings them closer to the great Leonardo da Vinci than anyone ever before. But their quest comes with risks – including death, or worse, being lost in time.