The Billion-Dollar Ransom — James Patterson; Duane Swierczynski

From #1 New York Times bestselling author James Patterson, six kidnappers pursue a whopping ten-figure payout in this thrilling novel featuring “breakneck pacing and loop-the-loop plotting” (Publishers Weekly).

Five members of a billionaire's family. In different locations. All kidnapped at the same moment.
Two children taken from a private-school bus. A film producer and a movie star grabbed at a hideaway resort. A beautiful wife whisked off the streets of Beverly Hills. 
A patriarch wants his family back. The cash, gold, jewels, are crypto are all ready.
There's only one problem: a brilliant, very stubborn FBI agent. Special Agent Nicky Gordon doesn't want to pay the kidnappers. 
Not a dime.