A brother and sister live practically as orphans in the small coastal town of Thunderbolt while their parents, CDC doctors, travel the world fighting dreadful diseases. When a phone call comes in that their parents are in quarantine the children are determined to get to them. Historic past events soon collide with the present foiling the children's desperate attempt to reach their parents in time! 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.