Ever since Grandpa got Parkinson's, Noah has noticed he hasn't been the same. Noah worries Parkinson's is his fault, but Grandpa assures him it's not--and that it won't stop him from having fun at the beach with his grandson!

A. Hultquist has a doctorate in educational psychology and is the author of four books about Parkinson's and dyslexia. He lives in Vermont. Joanne Lew-Vriethoff is an award-winning illustrator who was born in Malaysia, grew up in Los Angeles, worked in New York, and now lives in Amsterdam.