Thanks GP. The indication is it will be a typical fantasy hardcover, so B&W offset.
Size was passed on to me as:
Final print size will (hopefully) be standard hardcover, which is 15cm x 22cm pages, so with margins, we are looking at roughly 13x20 cm (roughly 5"x8")
What would you suggest the resolution of the image be for good B&W printing? My current image is sitting at 200dpi.

-Rob A>