Thats actually the book I picked up. :P

Anyway, I read both The Tomb and Dagon.

The Tomb is probably my favorite one of the four I've read. As always, the atmoshpere is simply amazing. The protaganist sees many strange and supernatural things as he comes and goes from the mansion, though in the end no one believes him, though you are given to reason to believe these supernatural event truly took place, just not in the way it may have first been presented.

Dagon is almost as awesome to be honest. A man coming back from a war gets stuck on a deslote land that errupts from the ocean floor. This is probably the best visual depction of the first four.

On too 'A reminiscence of Dr. Samuel Johnson and Polaris.