Greg Heffley and his family are getting out of town in the twelfth instalment of Jeff Kinney's bestselling series. With the cold weather setting in and the stress of the Christmas holiday approaching, the Heffleys decide to escape to a tropical island resort for some much-needed rest and relaxation. A few days in paradise should do wonders for Greg and his frazzled family. But they soon discover that paradise isn't everything it's cracked up to be. Sun-poisoning, stomach troubles and venomous creatures all threaten to ruin the family's vacation. Can their trip be saved, or will this island getaway end in disaster?