Mr Dan Metcalf 
The Catacombs of Chaos A Lottie Lipton Adventure [PDF ebook] 

Welcome to the British Museum, home to Lottie Lipton: nine-year-old investigator extraordinaire!
Lottie has lived in the British Museum all her life – she thought she knew it like the back of her hand! But when she finds herself locked in a secret tunnel deep beneath the museum she starts to worry that she might never find her way out.
Can Lottie, Uncle Bert and Reg find their way out of the tunnel by solving puzzles in the maze of passageways?
Perfect for developing and newly confident readers, Lottie Lipton Adventures are packed with action, adventure and puzzles for the reader to solve.