This is being re-offered as a freebie @
B&N as part of their "Free Fridays 'Three Fridays'" promo which gives readers 3 Christian mystery/suspense/thrillers free.
I think this is actually practically perma-freebie, since it's been $0.00 at both Amazon and B&N for quite some time now.
In any case, since the original post, in the meantime it's shown up at
Sony (available to Canadians) and
Christian Book (available worldwide) for those who need a standard ADE-DRM ePub format.