“Ted Sider”:http://fas-philosophy.rutgers.edu/~sider/ and “Earl Conee”:http://www.rochester.edu/College/PHL/conee.html are writing an intro metaphysics book which looks like it should be fun and useful. You can see a brief preview of it here.

bq. “Riddles of Existence”:http://fas-philosophy.rutgers.edu/~sider/riddles/riddles.html