A detailed account of the secret services operated by the great men of Elizabethan England, whose clandestine efforts sprang from the collective Protestant fear provoked by the exiled presence in England of Mary, Queen of Scots. After the rising of the Northern Earls in her favour in 1569 - an event that shocked the government - any claimant to the English throne was viewed with hostile suspicion as a potential focus for religious malcontents and...