This book is okay. It's a quick read, covers a fascinating topic, is well written, has a few interesting insights, and is amusing in places.
Unfortunately, it's like a ton of other similar books out there. I didn't find anything in this one that would be any better or worse than all those other books that you'll see under Customers Who Bought This Item Also Bought, What Do Customers Buy After Viewing This Item, and so on. If you've never read one of these before, great. You'll enjoy it. If you have, though (like me), you'll probably feel like you've already read it before.
It's basically an outsider's take on a fascinating "dirty job." Now, that includes some dark humor, some scattered musings, some interesting tidbits, and one (not-all-that-closely-related) vignette after another. It's kind of a like an extended magazine article, or maybe a series of magazine articles hooked loosely together.
What it's lacking is any real story line, depth in the musings, or feel for the characters. If that's what you're after, let me recommend, perhaps, In the Land of Long Fingernails: A Gravedigger in the Age of Aquarius. Forgive the pun, but Curtains, like a bad grave, was just a little too shallow for me.