So, just found out about this one within the last few days. When I realized it must be about the only novel out there which features Lord Dunsany as one of its characters, I knew I had to get it and read it.
So far as I can tell on a first brief glance, it's about Lovecraft and his father teaming up with Dunsany, Machen, Blackwood, Bierce, Hodgson, et al, to go fight the Mythos. There was a similar, but very very bad book along those lines a few years ago, featuring (so far as I can recall) Conan Doyle, Lovecraft, Houdini, and a Voodoo Queen. There's no Voodoo queen here, so far as I can tell, but there is a potential love-interest for Young Howard named Kathleen. I'm curious to see how Joshi presents these literary men, esp. Dunsany and Hodgson (sad to say I don't think the great M. R. James made the cut).
More when I've had a chance to read on it a bit.
current reading: see above.
UPDATE: I was wrong; M. R. James does indeed appear. --JDR