Join a group of four kid detectives and help them find out about STEM while developing problem solving, observation and deduction, and investigation skills. Our four detectives, Farah, Isla, Mohammad and Sam, are visiting a theme park with Mohammed's aunt Ghazala to celebrate her new rollercoaster design when they notice posters for a ride that looks almost identical! Did someone steal Aunt Ghazala's design? Does it have something to do with that suspicious-looking man? Join the Detective gang as they work the case, and learn from a mechanical engineer how rollercoasters are constructed and what gravity has to do with it. Featured interactive elements: - Search and find clues in the illustrations - Gather crucial information from info panels about materials, gravity and forces - Work out the best design for the first rollercoaster drop - Match the labels to the correct rollercoaster section Through interactive adventures that combine facts, brain-teasing puzzles and lively illustrations, these books impart STEM knowledge in an original way to inspire a love of the subject. The story in each book will have the reader solving puzzles, finding clues, cracking secret codes and uncovering mysteries. Perfect for aspiring detectives aged 7+.