While the Lane Sleuths are still vacationing on the coast, their cousins run into a mystery right at home in Benton. Nicole, Becky, and Abby are excited about this year's Fourth of July celebration, which will feature the firing of the town's cannon. When a collection of valuable coins dating from before the American Revolution is stolen, the girls set out to solve the mystery, along with their friend, Sharon. However, it soon isn't only the coins that have gone missing as the case becomes more and more complicated...and dangerous. The Colonial Coins is the sixth book in The Lane Sleuths Mysteries.