Here follows several hundred pages of backstory, which explains that Stephanie and her lover Max survived the explosion on his yacht, how she suffered amnesia, and how they hid out in France while Max resumed his dubious business practices. Sabrina's backstory, interwoven here, covers a number of side-plots that seem superfluous as you're reading them (college finance scandal, troubles with a grad student), but they happen to prove Sabrina's investment in her new marriage and family. While she keeps some remnants of her true past visible, her decision to sell "Sabrina's" antique business coincides with the discovery of her presumed-dead sister.
Probably the one flaw I found with the book is best described as the Annie Wilkes moment. Remember in Misery how Annie rants that Paul can't magically revive Misery because in his last book she was dead and in the ground? Deceptions had a similar problem - there are funeral scenes, and there is a body. A Tangled Web attempts to explain this with a guest on Max's yacht who (surprise) happens to look like Sabrina/Stephanie. An explosion would definitely have messed her up, and the ex-husband who identified her barely looked at the body. I guess, too, nobody bothers to confirm with dental records in Europe. Problem solved.
You get quite a bit of backstory in this novel, too, in the event you read Web first. As sequels go, I found it entertaining and I did like revisiting characters. Some might have the ending figured out, but I have to say it genuinely surprised me.