Archer & Armstrong wind down their tour of England with brother Ivar by making a stop at one of Armstrong's old hangouts, Stonehenge; The true origin of the ancient site is revealed, but only serves to force A&A to make a less than dignified exit from town; With Timewalker on trial for his crimes against the time stream, Armstrong must race to save his waylaid brother; But is he willing to make the ultimate sacrifice; Marooned at the edges of time, Archer & Armstrong are going to need help from someone who knows a thing or two about time travel.