Captain Blood

Captain Blood by Rafael Sabitini - The protagonist is the sharp-witted Dr. Peter Blood, a fictional Irish physician who had had a wide-ranging career as a soldier and sailor (including a commission as a captain under the Dutch admiral De Ruyter) before settling down to practice medicine in the town of Bridgwater in Somerset. (wiki)
The movie Captain Blood starring Errol Flynn was based on this great fiction book now formatted for nook.
Look for Rafael Sabitini's other Captain Blood pirate stories The Chronicles of Captain Blood and The Fortunes of Captain Blood.