Just finished "Far Side of the Sea" by Kate Breslin. She is a new-to-me author. This book is set in WWI. Here's the description from Thriftbooks:
In spring 1918, British Lieutenant Colin Mabry receives an urgent message from a woman he once loved but thought dead. Feeling the need to redeem himself, he travels to France only to find the woman's half-sister, Johanna, who believes her sister is alive and the prisoner of a German spy. As they seek answers across Europe, danger lies at every turn.
I couldn't put this book down! Romance, intruique, suspense all rolled into one. I highly recommend this book! I'm reading another book by the same author now, "High as the Heavens". So far, so good!
This is the first book in this series. Check her out, she's a Mississippi author too!!