When Katie accepts an invitation from her cousin Sally to visit a mysterious castle, she has no idea what she will be letting herself on for. After spending the night in an old inn on the edge of a remote and windswept moor and despite
receiving a spectral warning to stay away from the castle they set off the next day. What starts out as a normal bike ride across country soon turns into an experience that neither of them will ever forget. After exploring a medieval abbey and discovering an ancient stone circle they reach the ruined castle. But their ride home is interrupted by dark forces that catapult Katie and Sally back in time into the castle’s past. In order to escape the castle and find a way home they are forced to solve a seven hundred year old mystery by deciphering an ancient riddle. Along they way they stumble into lost Templar treasure and find themselves tangled up in gothic curses, ghostly encounters, witches spells and bad food!