Also much like Williams is the theological and philosophical subtext. Ms. Carl takes the ideas of good vs. evil quite seriously and probes deeply into the idea of redemption. She does not, however, take her themes lightly, instead giving them a vigorous shaking down before she's done, resulting in a gripping spiritual thriller. One could easily call this 'in the tradition of Charles Williams' — which it certainly is — but it more importantly moves beyond that master of the spiritual thriller.