内容简介：
Thrust back in time one thousand years, two boys accompanied by an irrepressible keeshond, must use every skill they possess, and courage they didn't know they had if they are to survive. They are pursued by a murderer, instigate a rescue, experience monastic life, find themselves in the middle of a Viking raid, a Druid ceremony, an abandoned tomb, and a haunted forest. For a chance to return to the present, they must solve the beggar's riddle and win the race against time.