The Name of the Game Is Kidnapping — Keigo Higashino

Battle-tested project leader at a PR firm and slippery bachelor, Sakuma sees himself as a player. His smug self-regard doesn't seem entirely unfounded, both in love and at work. When is idea for a mini-theme park is dismissed as too costly and vacuous at the last minute by a major client he seems to have met his match.

Katsuragi, an heir and executive at the global car maker, Nissei Auto, is back from a marketing stint in the US with an authentic conviction that everything is a game. Once the man's daughter by a former mistress teams up with Sakuma so she can come into her inheritance in an expeditious manner -- Juri is indeed her father's flesh and blood -- the game is good to go!

And the name of this game is a kidnapping!