(Magazine and periodical titles, on the other hand, can be trademarked.)
The author is only a problem if the author wants to be a problem. In absence of a copyright/trademark issue, the author would have to use one of the lamer "bad faith" claims like "defamation" (unlikely to suceed unless you're doing something antisocial with the domain), and/or "misguiding searchers" (unlikely to suceed if your site is about a different topic, or the book is so incredibly famous that everyone wants to read about it).
I wouldn't worry about it, myself.