It’s a campaign book, more or less, for Trail of Cthulhu (which is, of course, a game of 1930s-era Cthulhu Mythos roleplaying): I’ve wanted it for my collection for some time. As always, I’d like to thank my readers for buying it for me: I’m not exactly sure why I get to have my completely frivolous hobbies partially subsidized, but it’s greatly appreciated.