In their final month of elementary school, 11-year-old Aldo Zelnick and friends are faced with a series of Lasts: Last Cafeteria Meatloaf; Last Band Concert; Last Monkey Bars Fail. Blindsided by an uncharacteristic sense of loss, Aldo decides to bag some new Firsts—including putting himself out there for the 5th grade talent show—only to be beset by a series of logjams.

This twelfth installment in an A-to-Z alphabet series also includes a glossary of fun and challenging "L" words, such as lackadaisical, loony, and limbo..