LEVEL 2. The twenty-sixth book of their adventures. When Henry and his dog, Mudge, go with Henry's parents to visit Great-Grandpa Bill in the home with lots of other grandpas, they lead them all on a wonderful adventure.

LEVEL 2. While trying out the spy glasses, spy hat, and other items in their new spy kit, seven-year-old Henry and his dog Mudge make a new friend and form a spy club.