Book 2: David and Sally are an inseparable pair of kids at Knowre School, solving mysteries left and right. Delve into the book where they solve a mystery about an emerald, and a mysterious group called the Grey Jaguars, as they travel all the way to Peru, ranging from going to cafes with their friend Mark, to getting chased through an underground tunnel system. Watch as they solve a mystery about the Book of Opara and the emerald, before time can catch up to them.

Book 3: David and Sally, two 11-year-old kids, boy and girl, both with blondish hair, with a golden retriever, in front of a cabin in the woods, an eerie, tall ghost figure, floating nearby the right of the cabin, and the boy holding a lightly glowing blue gemstone ring.