One of my favorite novels when I was younger. The story of Joan meeting an all together human ghost with all the foibles of a child is both a bit spooky and, at times, quite poignant. There were ever only two printings that I know of - the Hardback in '73 and the Tempo paperback in '74. A good copy will run you about $250 if you can find, which is quite sad. It needs to be rereleased at least as a eBook.