The light we left behind / Tessa Harris.

"England: 1944. When psychologist Maddie Gresham is sent a mysterious message telling her to report to Trent Park mansion, she wonders how she will be helping the war effort from a stately home. She soon finds captured Nazi generals are being detained at the house. Bugged with listening devices in every room, it's up to Maddie to gain the Nazis' trust and coax them into giving up information. When Max Weitzler, a Jewish refugee, also arrives at Trent Park with the same mission, Maddie finds herself trapped in a dangerous game of chess. The two met in Germany before the war, and Maddie's heart was his from the moment they locked eyes. But Maddie has finally gained the trust of the Nazi officers at the house, and her love for Max must remain a secret. When the walls have ears, who can you trust?"--Publisher.