When Piper and Peter Post find a curious postcard from Kentucky, they get most suspicious! After all, it's addressed "Dear Bats" and they don't think the writer means baseball bats! So, they set off on a family vacation to a famous, enormous, bat-filled cave in where else? Kentucky - to solve the postcard mystery. Postcard Mysteries: What happens when you mix together curious kids, postcards addressed to mysterious names, and parents that own an RV? These exciting new mysteries will take kids ages 7-14 around the United States in a beat-up RV that is always gassed and ready to go. This new Mystery Series by Carole Marsh takes a fictional family immersed in all things "post" on the road as they try to solve these exciting postcard puzzles. 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.