Doctor Syn on the High Seas — Russell Thorndike

Doctor Syn On The High Seas is chronologically the first in the Doctor Syn series (the first book is the last chronologically), Syn on the High Seas kicks off the bloody adventure of Christopher Syn.

Syn is a mild mannered Doctor of Divinity, until tragedy and fate lead him to a life on the high seas as the bloodthirsty Captain Clegg.