Midwinter - John Buchan

The Jacobite army marches into England and Alistair Maclean, close confident of Charles Edward Stewart embarks on a secret mission to raise support for the cause in the west.

He soon begins to suspect someone close to the Prince is passing information to the Government, but just as he closes in on the traitor his own life is put in danger.

Who is the turncoat and can Maclean save his own life and his Prince?.