Two powerful families. A changing world. When Kathleen 'Kick' Kennedy left England to return to America, Europe was facing war and Billy Cavendish, future Duke of Devonshire and the man she loves, had told her he could never marry her. Now, in 1943, as London stands a shell of its former self, Kick returns hoping to reunite with Billy - but there are many obstacles ahead. Lady Brigid Guinness has swapped high fashion and exclusive dinner parties for long shifts as a nurse helping wounded soldiers, forming a close bond with one in particular. And yet the only person she can really talk to is a man shunned by her inner circle. Meanwhile, wide-eyed Sissy Maddington has arrived from Ireland under the care of the Guinness family. She's eager to explore everything London seems to offer - while she tries to forget where she came from.

As the three women navigate a changed city, they each discover a capacity for love they never could have expected. But will they find the strength to stay true to themselves? Inspired by real events, A Kennedy Affair is a powerful story of friendship, forbidden passion - and how in the worst of times we can discover the best of each other.