Mail Royal

A casket of incriminating letters from Mary, Queen of Scots. The letters would be an instrument of persuasion - or blackmail as others might call it. Whoever held them had a hold over the James VI King of Scots, now also King James I of England. But for Andrew, seventh Lord Gray, laying hands on the letters was not going to be easy. They were secure in the half-ruined Fast Castle that clung to the sea-cliffs of Berwickshire.
A castle that no one could enter if they were not welcome. And so young David Gray, his bastard nephew, was sent on a perilous mission .