The Secret Voyage of Sir Francis Drake 1577-1580.
By Samuel Bawlf
Take painstaking historical research, add a buccaneering yarn about one of the greatest sailors and adventurers who ever sailed the seas, toss in the development of new theories about exploration that read like a detective novel and you get this wonderful book by Samuel Bawlf.
The gist of the story is that Bawlf believes Drake got much further north up the coast of western Canada in a search for an Arctic passage than previously believed, and he makes an excellent case.
Maps and charts have always had great strategic value, and the charts and logs of Drake's various voyages were purposely obfuscated and censored.