Genius Has Its Price, Book 9 in Cocker Brothers, Ethan Cocker:

I love to work because it's a passion, not a job. I've been hired to unmask a hacker by a woman I mistake for a man. Whoooops. Kinda the same mistake Dad made with Mom. But Charlotte - aka Charlie - she is a Princess who treats me like a pauper. For a billionaire computer genius, that's crazy compelling. She's a problem I want to solve. But I've got a lot more than one. For example, who the f*ck snuck into my house and left this window open mid-hurricane?