Baldree delivers a lovely "so what happens *after* the big campaign is over" novel. His characters are fully rounded and the plot absolutely works. (Also...COFFEE!!) I was amazed to find out that this is his first novel, the writing is that good. I could see this appealing to low teens and up, although a precocious tween reader might enjoy it as well.
Definitely pick this one up if you like fantasy, D&D, good writing or all of the above!