I recommend a multichannel approach — approach the marketing from several different angles. One definite channel is social media. Leverage your Facebook page, Twitter, LinkedIn contacts, and more to get the word out. When the book is published, post it on Facebook with a link back to your website with more information and a way to order, for example.
London, 1944. Two young nurses meet at a train station with a common purpose: to join the war effort. Scarlet longs for the chance to find her missing fiancé, Thomas, and to prove to her family--and to herself--that she's stronger than everybody thinks. Nursing is in Ellie's blood, but her humble background is vastly different from Scarlet's privileged upbringing. Though Ellie puts on a brave face, she's just as nervous as Scarlet about what awaits them in France.