Tranquility Problems is the twenty-eighth book in the series. It mainly explains all the interruptions in Greg's life and all the conflicts he has in school.
Greg's had it with his family. He decides to move for sure, but his plan is spoiled by Gramma unexpectedly moving into the Heffley home. Greg's new pet, the pig, and Grandpa, are kicked out of the house.
When Greg shows her the Heffley cookie recipe, she gets addicted to sweets. And her moaning from rotten teeth adds on to Greg's tranquility.
Can Greg survive the latest of his conflicts? Or will he not see his freedom in his "Tranquility Problems"?