The source for Miss Callaghan, rare as all heck, did run me over $600 from Amazon UK. Only edition. No cover. Would’ve been a lot cheaper if I’d waited for the pound to crash, but, you know, I must have the precious.
Boldfaced emphasis added by me.
And now it’s set free, in e: Miss Callaghan Comes To Grief by James Hadley Chase
Grab the ePub version, drop into iTunes, sync your iPad, and read!