The iron duke The Iron Seas Series, Book 1

After freeing England from Horde control, Rhys Trahaearn has built a merchant empire. And when Detective Mina Wentworth enters his dangerous world to investigate a mysterious death, Rhys intends to make her his next conquest. When a dead body is dropped from an airship onto Rhys Trahaearn's doorstep, Detective Inspector Mina Wentworth uncovers the victim's identity--and stumbles upon a conspiracy that threatens the lives of everyone in England. To save them, Mina and Rhys must race across zombie-infested wastelands and treacherous oceans