Fleishman Is In Trouble by Taffy Brodesser-Akner

Finally free from his nightmare of a marriage, Toby Fleishman is ready for a life of Tinder dating and weekend-only parental duties. But as he optimistically looks to a future of few responsibilities, his life turns upside-down as his ex-wife Rachel suddenly disappears. While Toby tries to find out what happened – juggling work, kids and his new, app-assisted sexual popularity – his tidy narrative of a spurned husband is his sole consolation. But if he ever wants to really understand where Rachel went and what really happened to his marriage, he is going to have to consider that he might not have seen it all that clearly in the first place.