He did let my sisters see it, and I gather from them it was a book about giving your soul to the Devil for material wealth. He moved to California before he died, so he may have left it out there somewhere. His house burned down sometime around 1980, but the lot it was on is still wooded and undeveloped. It's inside the Washington D.C. beltway, in the suburb of Bethesda. Some rich relatives (which I am not) have been paying the taxes all these years. I remember my sister told me she asked him about it before he died, and he told her "you'll never find it." You may be able to see the lot from a satellite image. The South end borders Beech Avenue and the North end borders a hill that used to have gooseberry bushes growing wild, Whitley Park condominuim and then the beltway North of that.