The secret language of stones

In World War I Paris, Opaline Duplessi, a jeweler at La Fantasie Russie, possesses a rare gift: she can translate the energy from stones to receive messages from beyond the grave. She sees herself as a messenger for fallen soldiers, until one communicates directly with her. This message sends Opaline on a journey through wartime Paris and across the English Channel, where the exiled Romanov dowager empress awaits news of her family's fate.