While visiting a movie set in Hollywood, the Thea sisters set out in search of a thief who has stolen an important reel of film from the studio.

The pressure's really piling up on Greg Heffley. His mom thinks video games are turning his brain to mush, so she wants her son to put down the controller and explore his creative side. As if that's not scary enough, Halloween's just around the corner and the frights are coming at Greg from every angle. When Greg discovers a bag of gummy worms, it sparks an idea. Can he get his mom off his back by making a movie... and will he become rich and famous...

"P.T. and Gloria try to save the Wonderland again by getting a teen singing sensation to shoot a movie at the motel"-- Provided by publisher.

When film producer Moe Block Busters offers to make their book into a movie, Iggy, Olive, and Seymour head to Hollywood where Olive, furious at being written out of the script, enlists the help of a famed femme fatale to scare the despicable director half to death.