This volume contains a fascinating biographical account of the eighteenth century secret agent "Pickle". Within this book, Andrew Lang identifies the infamous agent as Alastair Ruadh MacDonnell, a Scottish Jacobite who acted as a spy on Prince Charles Edward after 1750. This volume contains a wealth of fascinating information, and will be of considerable utility to those with an interest in the intriguing case of "Pickle" the spy. The chapters of this volume include: "The Last Rally of Jacobitism Hitherto Obscure", "Nature of the New Materials", "Information from Spies", "Unpublished Stuart Papers", "The Chief Spy", "His Position and Services", etcetera. Andrew Lang (1844 - 1912) was a Scottish poet, novelist, and critic. Many vintage texts such as this are increasingly scarce and expensive, and it is with this in mind that we are republishing this book now, in an affordable, high-quality, modern edition. It comes complete with a specially commissioned biography of the author.