The Fishy Friends Aquarium was ready to close for the evening when Fred the fish feeder noticed something was not right at the Shipwreck Exhibit. What happened to the treasure in the treasure chest? And can Sergeant Sally, with superior sleuthing and help from young readers, crack this fishy case? 26 pages, including 8 acetate pages of see-through art. Young readers use the punch-out paper "flashlight" to illuminate clues hidden in the art on plastic see-through pages. Ages 4 to 9.