James Preller's 'The Case of the Groaning Ghost' is a delightful entry in the Jigsaw Jones series, perfectly crafted for early elementary readers transitioning to chapter books. The story centers on Jigsaw, a young detective whose usual cases of lost pets and missing homework take a supernatural turn when ghosts begin to 'haunt' his classmates. The plot thickens with the introduction of a rival ghostbuster, adding a layer of competition and humor to the mystery. The book handles the 'spooky' topic of ghosts with a light, playful touch, ensuring it's more exciting than genuinely frightening. The 'ghosts' are presented as part of a mystery to be solved, rather than truly terrifying entities, making it suitable for children who enjoy mild thrills. The emotional arc is one of curiosity and determination, as Jigsaw works through the clues and navigates the challenge of a competitor. This book is ideal for a child who loves solving puzzles, enjoys school-based stories, and is ready for a slightly longer read with a clear, engaging plot. A parent might reach for this when their child expresses interest in detective stories or 'spooky' themes but isn't ready for anything truly scary. Parents should preview the concept of 'ghosts' and reassure children that the story is a fun mystery, not a scary one. Younger readers (7-8) will enjoy the straightforward plot and Jigsaw's relatable challenges, while slightly older readers (9-10) might appreciate the detective work and the humor. What sets this book apart from other early mysteries is its blend of classic detective work with a fun, slightly supernatural twist, all within a familiar school setting.