Rolling in the Deep by Mira Grant

Rolling in the Deep - Mira Grant

This is a rather short, nicely written novel that explores the story of the ship Atargatis, lost at sea with all hands.  "Some have called it a hoax; others have called it a maritime tragedy. Whatever the truth may be, it will only be found below the bathypelagic zone in the Mariana Trench…and the depths are very good at keeping secrets".  This is a mix between mythological/urban fantasy, horror and mystery.  I found the story to be an original take on an old myth.  There is apparently a sequel to this story out later this year.