Negative Influence

From: Detective
Description: Buddy, I think I know who the mysterious passenger of Compartment No. 8 is. But the train’s clouding my head and trying to confuse my thoughts. The Conductor warned me about this. Perhaps artifacts can protect us from the Foggy Express’s negative influence. Could you lend me some?
Completed: While the artifacts are blocking the Foggy Express’s negative influence, let’s look at what we have again. A lottery ticket, poker amulet, and a clip with the initials "R. D." Who are you, mysterious R. D.? Maybe Roger Doubledeal? That’s it, I even have a dossier on him!