Magical Express Murder Case: File 4 - S2-E13
Plot hole: The ending twist is nonsensical; the disciples have been using the tricks in Reiko Chikamiya's notebook for over 5 years, so the 'trap' inside the notebook could, and should, have happened at any point during that time. There's nothing in the killer's actions that makes that particular magic trick happen, nor he swapped or manipulated it.