The Millionaires — Brad Meltzer

Two brothers.
Three Secret Service agents.
And millions for the taking.
Brad Meltzer, the author of the runaway bestseller The First Counsel, is back with another edge-of-your-seat thriller-a tale of two brothers trying to hide in a world where your every step can be traced.
THE MILLIONAIRES
It started as the perfect crime. Then it took a turn for the worse. Charlie and Oliver Caruso are brothers who work at Greene & Greene, a private bank so exclusive you need two million dollars just to be a client. But when the door of success slams in their faces, they're faced with an offer they can't refuse: three million dollars in an abandoned account. No one knows it exists, and even better, it doesn't belong to anyone.
It's a foolproof crime. More important, for Charlie and Oliver, it's a way out of debt and the key to a new life. All they have to do is take the money.
But when they do, they quickly discover they've got a lot more on their hands than the prize. Before they can blink, a friend is dead-and the bank, the Secret Service, and a female private investigator are suddenly closing in. What invisible strings were attached to that account? How are the brothers going to prove they're innocent? And why is the Secret Service trying to kill them? Trapped in a breakneck race to stay alive, Charlie and Oliver are about to discover a secret that will test their trust and forever change their lives.