It's a hat box Evan. Obviously there's a hat inside, what else would it be?
Elmwych Comic P.44
Panel 1: Evan Doncaster and Isabella have parked on the driveway of a large Victorian house. It is night and Doncaster is admiring the property from the driveway while Isabella opens the back door of the car.
Doncaster: So this is the place? Most impressive! And it backs right onto the cemetery? The perfect base for my operations!
Doncaster: You may rest assured Isabella, everything has been planned as carefully as you guard that box of yours!
Panel 2: From inside the car we see Isabella reaching for her green leather hat box, which has been carefully placed on the back seat.
Doncaster: Speaking of which, forgive my curiousity, but...
Panel: Doncaster continues to admire the house. In the forground Isabella's left arm is visible as she clutches the hat box.
Doncaster: ... what on earth do you keep in there?
Panel 4: Close in on the hatbox, which is now crazed with what looks like a lightening bolt pattern against a dark sky. Just behind, Doncaster stands in silence a lightening bolt splits the sky above him. His expression is one of motionless dread.
Panel 5: In the background Isabella enters the front door of the house, while Doncaster still stands on the driveway, looking confused.
Doncaster: Er, you were saying? Ah yes, cup of tea?
Doncaster: I could absolutely murder one!