Indeed we have a clear moment of Chekhov’s gun as she is given the rape alarm set, the spear gun (for use on the honeymoon!) and a set of hammer and stakes. In fact only the hammer and stakes seem appropriate after we have seen the opening.
So, into the thriller normal and, as it was just the writing process for her latest book, the vampire section is left behind. The thriller aspect is actually fairly transparent (and I guess that was kind of the point) but the coda is magnificent. At the time of writing there is no IMDb page.