In Partypooper, book 20 of the Diary of a Wimpy Kid series, Greg Heffley is planning the ultimate party–for himself.

Greg Heffley is not a fan of surprises–especially when it comes to his birthday. But he never could have guessed the shocking surprise his family has in store for him this year.

When Greg’s epic party plans start to unravel, he holds out hope that he’ll get his one birthday wish–a rare trading card that’s worth a fortune. The problem is, everyone else is after it, too, and there’s no guarantee he’ll snag it first.

Will Greg’s birthday dreams come true? Or will he learn to be careful what you wish for?