"Humphrey knows friends can come in all shapes, sizes, and species, but some big animals—like dogs—can make him NERVOUS-NERVOUS-NERVOUS (remember Clem?!). But then a very gentle dog comes to Longfellow School to help his classmates with reading and he meets another one who can do amazing tricks. There is also a mystery afoot about a lost dog. Humphrey is hamster-iffic at finding clues and solving mysteries, and he's eager to lend a paw to find...