In "Sin pareja / The Third Wheel", Greg Heffley is once again faced with the usual challenges of being a middle schooler, but this time, the focus is on his attempts to navigate the world of crushes and relationships. As Valentine’s Day approaches, Greg finds himself feeling like the third wheel, as his friends start pairing off and Greg remains single. He’s desperately trying to figure out how to fit in with the couples around him while also dealing with his own awkwardness and lack of romantic success. With his usual wit, Greg tries to find ways to survive middle school without becoming a total outsider. As always, the book is filled with hilarious journal entries, doodles, and illustrations that capture Greg’s misadventures, from his failed attempts at romance to his interactions with his friends and family. Whether it's trying to be part of a couple or managing his social life, Greg's journey remains both funny and relatable for tweens.