You are an explorer and adventurer and you’ve just returned to your home in London after a long trip through Greece.  Your best friend Twig is bedridden after a rock climbing injury, but he has a tip he’d like you to follow.  He’s been contacted by a man named Alastair Shepherd, who wants to divulge secret information about the missing heelstone of Stonehenge.  He’d like to meet during the summer solstice, a pivotal and celebrated event at the ancient site—and taking place in just a few hours!

Strange Fact: This book was re-imagined so many times that the artwork was constantly updated as it was being written and rewritten.  In the end, six different artists created artwork for this title before the finals were selected.