Larkin Was Upset
Marion and Petra created a hole on the roof without a sound and then jumped down silently. The atmosphere inside the mansion was very quiet. Marion opened her cellphone and observed the red dot on the screen. She quietly gave a signal to Petra to follow her.
They crossed the hall on the 3rd floor of the mansion, descended the stairs, and followed the dot on her cellphone to find Larkin.
When Marion saw Larkin a few days ago when she gave him the antidote, Marion secretly placed a tiny tracker in the mafia's suit.
That's what she now used to track Larkin's whereabouts. The tracker on Marion's cellphone led them into a huge room at the end of the hall on the 2nd floor. Using a thief's key that he always carried everywhere, Petra opened the door of the room.