Critically acclaimed author Cammie McGovern presents a heartwarming and humorous middle grade novel about the remarkable bond that forms between an aspiring service dog and an autistic boy in need of a friend. "Joyful, inspiring, and completely winning, Chester and Gus is unforgettable," proclaimed Katherine Applegate, #1 New York Times bestselling author of the Newbery Medal winner The One and Only Ivan. Chester has always...