I've just been reading "Prophecy", by Peter James.
Charles Williams it isn't, but there are some faint echoes of "War in
heaven", so some Williams fans might enjoy it.
For those interested, my review is at:
If any other Williams fans have read it, it might be quite interesting to
discuss how it compares here, though if anyone hasn't read it but plans to do
so, it would be better to read it before trying to follow the discussion to
avoid the risk of plot spoilers.