Unable to persuade a young pig from frolicking in the mud, her family finally joins her for a mud party.

When fifteen-year-old Greyson Bennell volunteers to help with the cleanup effort after a massive mudslide devastates his California town, he is not expecting anything but some hard work--but this disaster was caused by a very peculiar storm and he soon realizes that the mud itself is making the other volunteers behave in an ominous manner.