The Darkest Hour — Barbara Erskine

In the summer of 1940, most eyes are focused on the skies above. The battle for Britain has just begun. But talented artist Evie Lucas has eyes for no one but a dashing young pilot called Tony, and spends her days sketching endless portraits of him. She wants his parents to have something to remember their only child by in case it all goes wrong in the war... Seventy years later, recently widowed art historian Lucy is trying to put the pieces of her life back together. But when she accidentally ends up stirring up a hornets' nest of history which has been deliberately obliterated, Lucy finds herself in danger from people past and present who have no intention of letting an untold truth ever surface...