Philip K. Dick 
Hanging Stranger [PDF ebook] 

A stranger hangs from a lamppost before Ed Loyce, the noose wrapped tight around his neck. yet, despite the corpse suspended in broad daylight, and in plain sight of others, none seem to care – or even notice. Determined to understand what has caused this, Loyce takes it upon himself to unravel this morbid mystery, and put an end to it once and for all.