Chasing a Ghost – D. A Ravenscroft

For eight years Combeferre has thought his best friend, Enjolras, dead. After their attempt at revolution is quashed by the citizen king, Louis-Philippe, the young doctor learns to live with grief. That is, until he hears rumours that his friend is alive, living in anonymity outside of Paris. Expecting more disappointment, Combeferre makes it his duty to investigate, only to unwittingly set into motion a series of events that will lead his friend back into the dangerous world of Parisian politics.