This book is engaging, but it's no "Shadow Divers". For one thing, there's not much plot and the author had to sort of create a narrative and stick in bits of Pirate history to glue it all together. Then the two primary personalities come off pretty badly. One is portrayed as crazy-violent, the other as an obsessed ego-maniac. I guess it's all meant to paint a picture, but it's a little too much personal information for me. The book also ends abruptly, with 97% devoted to a fruitless search and 3% a quick summary of what they found.
So although I enjoyed reading it, and made it through to the end. It will not be a keeper and is headed to a used book store shortly.
BTW, if you have not read "Shadow Divers", for Pete's Sake go get a copy now! Now that was an extraordinary tale.