Warlock (1959)

[jbor at bigpond.com]

Pynchon's "blurb" was actually written over four decades ago:

'A Gift of Books', _Holiday_ 38.6, December 1965.

Comments by eight writers on "neglected books". For the Christmas issue 
of _Holiday_ (i.e. their "gift").

http://www.pynchon.pomona.edu/uncollected/gift.html

best

> The movie's OK, as far as westerns go, though it deviates from the 
> mood and themes of the book.
>
> The book's OK too, as far as pulp westerns go. Overrated here, however.