Li'l Ronnie Post
it's a neat little game based on, and compatible with, 'When Darkness Comes'.
It is a nice deal, but it's actually a bit more than compatible with WDC. It looks like you mostly need the latter; if you're expecting a "full" stand-alone game, you might be disappointed - which would be a shame since this looks pretty nifty.
From the BGG page:
The game requires the use of "When Darkness Comes...The Awakening," but we made the use minimal in a couple of the scenarios. The first scenario can be played without the core set.