Shadow of a resting player

Exploration Stage: Red Rose Cafe
From: Detective
Description: Thanks to some witty citizens, we've got nothing left for us to do. Everyone will be doing their own investigations! I don't care. We'll just focus on rescuing the card cheaters. Looks like there are ghost prints on the dishes. Let's take a closer look.
Completed: Ah! These prints must belong to a participant in the Mystic Tournament. Let's give them to Martha and have her find the entrance to the tournament.