"The Third Wheel" by Jeff Kinney is the seventh book in the Diary of a Wimpy Kid series, published in 2012 as a trade paperback. This humorous juvenile fiction novel explores themes of family, school, and social issues, making it a engaging read for young readers. With a focus on entertaining stories and relatable topics, this book is sure to be a hit with fans of the series and those looking for light-hearted reading material.