Written by Peg Willis; 
 
Andy Malone, his sister EmmaLea, and their cousin, Paul Tanner, have discovered a cave on their secret island. When the two families' vacation plans fall through, the three teens camp out on the island for a few days. They discover that their cave links with a tunnel- a lava tube leading under the river and across town. But who has left the footprints they find in the tunnel? Why does the tunnel lead to the courthouse? And what does the old poem in the attic have to do with it all? Join the adventure- discover the answer!