From the back of the book:
"Calling all Doug fans and aspiring sleuths! Join in all the madcap, mysterious fun in the seemingly normal town of Bluffington as Doug and the gang unravel five new mysteries.
Have yodeling aliens invaded Mr. Bone's cavities?
Is a creepy cretin out to pulverize Patti's campaign?
Why has Porkchop become a mean barking machine?
The answers to these questions -- and more -- await Doug fans clever enough to follow the clues and sniff out the suspects.