Kidnapped - Robert Louis Stevenson

Another great story by Stevenson.  The plot is slower moving than Treasure Island, but there is a wonderful long section of wanderings around the Highlands as the two main characters hide from the police and army.  The description of the settings is wonderful, and you meet a host of interesting characters.  It gives you a glimpse of occupied Scotland in the 1700s and the political forces and conflicts of the time.  There is also a section set in Edinburgh of the time, a swirl of crowds and narrow, twisting streets.