The Hidey-Hole

When Bobby, Betty and Jacko go blackberrying in order to raise money for a good cause, they are very disappointed to find no blackberries. They do discover, though, a hiding place under the bushes--the sort of place that is perfect for their secret meetings. What they don't know is that their newly found hidey-hole has been used by someone else. When they do, the real excitement begins--and they are plunged into the heart of an exciting mystery.