Jonathan of Scots

Political intrigue sets off a string of adventures in 17th-Century Scotland. An evil duke burns young Jonathan's family home and usurps his lands, then falsifies charges against him for murder and arson.
Jon's loyalty is closely associated with the Stuart kings of England, whose religious belief is being challenged by Oliver Cromwell during the Second English Civil War.
Jon sets out on a quest over land and sea to find a priceless heirloom, held by one of his four uncles, one of whom wants to murder Jon because whoever owns the gem has power to assist the Stuarts regain the throne. In this fast moving novel, numerous enemies stalk Jon and his companions, at one time confining them to a deep dungeon with no chance to survive.
Two tender love stories evolve while Jon searches through colorful historical locations, including a sea voyage and conflict with pirates.