Bay of Devils by Grahame Shannon

In 1918 the SS Princess Sophia sank in Alaska with 350 souls aboard. All perished when the ship, stranded on Vanderbilt reef, slid off into deep water.
Going through her father's effects in 1968, Cindy finds an old flask. The message inside is from the doomed ship. She delivers it to the original address, which is nearby. Elizabeth Hadley, now in her seventies, reads the letter from her former suitor with excitement. She hires Sean to lead an expedition and unravel the mystery. He tracks down Cindy, and the chemistry between them is immediate.
Lizzy introduces the crew of her 110-foot classic yacht Lady L, including Ajax, an acid-tongued parrot. With Cindy as cook, and Levi, a mysterious Israeli ex-soldier, providing security, Sean prepares for the voyage to Alaska.
However, they aren't alone.
There are others after the booty, and they are willing to kill anyone who gets in their way.
So, with pirates hot on their trail, will they find the treasure and unlock the secret behind the half-century-old mystery? Find out in Bay of Devils, from award-winning author Grahame Shannon.