So confused

Lately in 2012, one of the main characters, Wylie, has been nabbed by aliens. But upon being kidnapped, he discovers he's not human. He's also an alien, but just hasn't known it. But then he rubs cream onto himself and turns human again. So does his wife, which he didn't even know he had. But it turns out she was his human wife too. And this is what's puzzling me. I've just been wondering what Strieber is trying to tell his readers from this installment. My belief is that he's telling his readers that sometimes they're blind to what's in front of them. They'll have the means to find something out, but just won't pursue it, or even acknowledge that it's there. Just think of how many times you've blamed something on the closest person to you, with no evidence. Then later on you find out somehting new and it turns out they're not even the one to blame.