The Pirate's Revenge

Here it is!
The Pirate's Revenge, book two of the Swashbuckler trilogy, is out on October 6:

Once a pirate slave, Lily Swann is navigator on the Mermaid, running the French blockade of Malta, when she learns her long-lost father may still be alive.
But before she can follow up her discovery, Lily clashes with the vile Captain Diablo, who forces her to show him the way to the famed Golden Grotto. Furious when he is unable to locate its fabled wealth, he abandons her to die in the darkness. As she battles her way out, Lily discovers the true treasure of the grotto, and her silver sword is soon put to the test.
But after another confrontation with Diablo, Lily is cast adrift with her old adversary, Hussein Reis, in a tiny boat without oars, sails, food or water - the pirate's revenge.

You can download a larger version of the cover here.