The Sins of the Father by Jeffrey Archer. It's Book 2 of The Clifton Chronicles.

The story picks up in 1939 as Harry Clifton, newly arrived in New York, is fleeing a wrongful murder charge in England. He assumes a new identity in America, while back home his love Emma Barrington and his family are left to deal with the fallout. The series follows the Clifton and Barrington families, tied together by rivalry, secrets, and a long-running inheritance feud. This installment moves between wartime Britain and the U.S. and builds on the first book, Only Time Will Tell. It's best read in series order. Specifications (from the cover and the standard edition; the photo doesn't show these, so check the back cover or copyright page)

• Author: Jeffrey Archer
• Series: The Clifton Chronicles, #2
• Genre: Historical fiction / family saga
• Format: Paperback, as in your photo
• Publisher: Pan Macmillan (the usual UK paperback publisher)
• Length: Roughly 400-450 pages
• Cover: "The Global No.1 Bestseller" tagline and a "Greatest Storyteller of Our Age" (The Mail on Sunday) badge, with a steam train and a woman and soldier on a platform