I thought my book title was really unique but I’ve just discovered another book with the same title. What can I do?

-M

There are literally hundreds (if not thousands) of books with identical names on the market. You can’t copyright a title. You can, however, trademark a title.

I would, however, advise against giving your book a title that is identical to one already on the market. You don’t want to confuse your readers!

You can do a free search for trademarked terms here:
http://tess2.uspto.gov/bin/gate.exe?f=searchss&state=pttq08.1.1