Heh, I was just getting ready to post one of Leiber's novels and Xeno beat me to it, though I was going with a different title. Strangely this title is only listed at Sony's store, I don't see anyone else carrying it as an ebook.
Our Lady of Darkness -
Fritz Leiber
"
Our Lady of Darkness introduces San Francisco horror writer Franz Westen. While studying his beloved city through binoculars from his apartment window, he is astonished to see a mysterious figure waving at him from a hilltop two miles away. He walks to Corona Heights and looks back at his building, to discover the figure waving at him from his apartment window--and to find himself caught in a century-spanning curse that may have destroyed Clark Ashton Smith and Jack London." -Sony Store
-MJ