Mimi inherits a gold mine-the Gold Bug! On summer break, Christina and Grant join their mystery book-writing grandmother and cowboy pilot grandfather, Papa, on an adventure to check out the mine and discover a mystery that could mean boom or bust! Each mystery incorporates history, geography, culture and cliffhanger chapters that keep kids begging for more! Each mystery includes SAT words, educational facts, fun and humor, built-in book club and activities. Each Carole Marsh Mystery also has an Accelerated Reader quiz, a Lexile Level, and a Fountas & Pinnell guided reading level.