Here There Be Monsters (The Iron Seas #0.5)

Two years ago, blacksmith Ivy, desperate to flee London, purchased her overseas passage by agreeing to spend the voyage in the bed of the pirate captain, Mad Machen. Saved at the last minute by his rival, Ivy scraped out a new life in Fool’s Cove…until Mad Machen finds her, forces her to accept a job that will create a monster, and reminds her that she still owes him the price of a journey…