On any given day in 1883 New Orleans, at 416 Royal Street, you will find a black door and a discreet bronze plaque engraved with “S&H Investigations”, should you need such services. Within, you will be offered café au lait and beignets, and taken down a softly-lit passageway to meet Fiona Shanahan, a pretty young Irishwoman, and her associate, Michael Henley, a gentleman with a hard face but a kind smile. You will leave assured your troubles are in good hands. However, while charming, neither Fiona, Henley or S&H are quite who they purport to be.