When Reddie comes over to Archie's house excited to go to the big Hat Day party, she is surprised to learn that he can't make it. He has lost his favorite hat! Luckily, when it comes to finding things (and hats), two heads are always better than one! So Archie and Reddie set about trying to locate it. The only problem is Archie's home is a little messy. And Reddie has no idea what this hat looks like. And, oh, Archie also has dozens and dozens of them to sort through! Will they ever find Archie's favorite hat, or are they going to have to miss the party?