The French Powder Mystery

A — Elevator shaft

B — Stairway shaft

C, D, E, F, G — French apartment

C–Lavatory

D — Bedroom

F — Anteroom

E — Library

G — Cardroom

H — Ground floor door to elevator, facing 39th Street corridor

I — Ground floor to stairway, facing Fifth Avenue corridor

J — Window containing Lavery Exhibition

K — Door to murder-window

L — O’Flaherty’s office, with view of 39th Street entrance

M — Door from freight room