The fourth family comedy based on Jeff Kinney's super-popular junior-high saga is actually based on the ninth book. Jason Drucker picks up the pen from Zachary Gordon as hapless young journal-keeper Greg, while Alicia Silverstone and Tom Everett Scott step up as his well-meaning parents Susan and Frank. This escapade sees Greg persuade the family to take a road trip to visit Grandma on her 90th birthday. Which sounds very thoughtful... but the journey is just a sneaky ruse to allow Greg to attend a nearby gamer convention. Needless to say, his machinations don't go entirely to plan. Upbeat stuff for tweeners.