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- ISBN: 9781608867127 | 1608867129
- Cover: Paperback
- Copyright: 8/11/2015
Unsavory characters have been spotted in the park. Earthquakes have been disturbing the house. Pops’s sock drawer has been pilfered. Yep, it’s mystery time. When trouble settles over the park along with the chill of winter, it’s up to Rigby, Mordecai, and the rest of the crew to figure out who’s behind--or below--the disturbances.