Sons of Fortune by Jeffrey Archer

Bestselling author Jeffrey Archer returns with a powerful tale of twins separated by fate and reunited by destiny.

In the late 1940's in Hartford, Connecticut a set of twins is parted at birth. Nat Cartwright goes home with his parents, a schoolteacher and an insurance salesman. But his twin brother is to begin his days as Fletcher Andrew Davenport, the only son of a multi-millionaire and his society wife.
During the years that follow, the two brothers grow up unaware of each other's existence. Nat leaves college at the University of Connecticut to serve in Vietnam. He returns a war hero, finishes school and becomes a successful banker. Fletcher, meanwhile, has graduated from Yale University and distinguishes himself as a criminal defense lawyer before he is elected to the Senate.
Even when Nat and Fletcher fall in love with the same girl they still don't meet. They continue on their separate paths until one has to defend the other for a murder he did not commit. But the final confrontation comes when Nat and Fletcher are selected to stand against each other for governor of the state.
In the tradition of Jeffrey Archer's most popular books, Sons of Fortune is as much a chronicle of a nation in transition as it is the story of two remarkable men and how, eventually, they come to discover the truth - and its extraordinary consequences...