I'm not certain where I picked this book up now, but it's been sitting on my bookshelf for a while, waiting to be read. I have to admit that it's a book I'd be unlikely to pick up now because of its veritable dearth of female characters. Other than 2 historical ones, there is exactly 1 named female character who has less than a chapter's worth of a role, and 3 other women who are mentioned (1 named, 2 unnamed) and 2 of those are just there to be victims.
While I understand that a lot of the characters had to be male given a large portion of the book is set during WWII and the roles involved were only done by men, there was absolutely no reason why the modern day photojournalist couldn't have been female. Or the diving instructor. Or the captain of the boat they hired. So, yes, it's a book I'd not buy anymore now as there are tons of excellent books out there that don't spend 500 pages ignoring the existence of women.
As for the tale itself, it was interesting and had a few twists I didn't see coming. It did, however, suffer from the same issue a lot of these books that have stories set both during the war and the present: predictability of ending. I mean, if the Nazis have an evil plot to win the war, you already know that it fails. Rather than attempting to make up for that, Alex made it worse by telling us what happened to the crew of the Medusa early on. This added another level of predictability to the whole tale and bled the suspense out of some of the fight scenes as you knew the main outcome.
The basic premise was okay, but I felt the middle and end of the book was too weighted towards the past. While Max's storyline and that of his crew was interesting, the bits in the present were all finished and tied up far too quickly and neatly. It just felt rushed and as if it was a pesky detail the author couldn't be bothered to deal with.
Also, the first part of the tagline on the cover gave away a major element of the plot that only comes up around page 400, while the second part is flat-out wrong, given the ending of the book. So misleading to false advertising.
Therefore, entertaining and interesting, but not a book I will be keeping or recommending to anyone. Nor would I pick up another book by this author without a pretty glowing recommendation by a friend.