This is book number 3 in the Thanatos Rising series.
Kix Welty is Seattle's fastest pizza delivery driver, an easy feat for someone who's recently learned how to teleport. When a friend's child is kidnapped out of school, Kix knows she can help find him. She's ready to make the switch from pizza hero to super hero. All she has to do is figure out how to teleport through infinite universes, to a place she's never been, without guidance or going insane. Easy-peasy, right?
Toesy knows how.
Toesy is thirty-two pounds of accidentally cybernetically-enhanced, Maine Coon housecat. He didn't ask for god-like powers but surely no one is better qualified to wield them. Normally, he dislikes children but this one is different. This one is nice. And Toesy wants him back. Whoever took the boy had better start running because they're about to have one furry CATastrophe on their hands.