The Green Turtle Mystery

Djuna and Ben weren't sure they believed in ghosts. The little girl who opened the door of the haunted house didn't look like a ghost yet she vanished into thin air. They had to find out what happened to her. And they had to rescue Waterbury, the time-telling turtle who walked into the deserted house—and didn't walk out. Djuna found clues and he added them all up to solve a case the secret service couldn't crack!