The Littles Go Exploring

Tom and Lucy find a secret room!

"We'll have to tell mother and father right away."

"Why?" asked Lucy. "What did you find, Tom?"

"These papers belong to Grandpa Little, that's why," answered Tom. "This room — he must have come here and no one knew."

"Grandpa Little?" asked Lucy. "But he...he disappeared a couple of years ago. Everyone says he is probably dead...except Granny Little."

Maybe Grandpa Little is alive! The Littles read his diary and study his maps. Can they find Grandpa Little?