The Wife Deception by Piper Knox

He doesn’t know he married the wrong bride

Nolan Hawthorne will do whatever it takes to acquire the one company his father could not get. And if it means marrying Aelin Burgess, notorious socialite, he will do it. But what he doesn’t know, is that the woman opposite him at the altar, me, is not Aelin.
I am her cousin.
And have agreed to my grandfather’s harebrained scheme to marry Nolan in Aelin’s place. As long as he doesn’t find out the truth, my family should be fine. And as long as I don’t fall for his irresistible charm and good looks, I should be fine.

The Wife Deception is an arranged marriage billionaire age-gap romance that is part of a series but can be read as a standalone.