The shadow land - Elizabeth Kostova

Soon after arriving in Bulgaria a young American helps an elderly couple into a taxi - and realises too late that she has accidentally kept one of their bags. Inside she finds an ornately carved wooden box engraved with a name: Stoyan Lazarov. Raising the hinged lid, she discovers an urn filled with human ashes. As Alexandra sets out to locate the family and return this precious item, she gradually uncovers the secrets of a talented musician shattered by oppression - and she will find out all too quickly that this knowledge is fraught with its own danger.