John Buchan 
Midwinter DUN 
Certain Travellers in Old England

Midwinter is a wonderfully written historical novel. Alastair Maclean. A scottsman who has been in exile in France goes to Englad to join the Scottish Army as it advances on London. En route Maclean discovers a plot that will endanger the Scottish cause. Further complicating his situation he finds himself falling in love with a married English Lady. He must decide between honor, love, and country.