"What is Lag Ba'Omer?" Sadie and Ori ask their grandfather, who sends them off ona mission to solve the mystery. They learn the surprising history and traditions behind the holiday, and invite their friends and family to a Lab Ba'Omer pcnic and celebration. The fourth title in the "Sadie and Ori" Jewish holiday series including Sadie's Sukkah Breakfast, Sadie and the Big Mountain, and Sadie's Almost Marvelous Menorah.