The language and content in Slave to Fortune is pitched at readers from approximately 12 years and upwards.
Reviews of the book to date indicate that Slave to Fortune appeals to older as well as younger readers. (You may wish to take a look at the reviews on Amazon or Goodreads to confirm this.)
The novel is pretty wholesome (nothing sordid to beware of), though it does contain some ‘swashbuckling’ style fighting in places and the opening seen is dramatic – in case that’s not to your taste.
Take a look at the free sample of the first chapter, if you’re not sure. This will give you a good feel for the language and content of the book.