Rex is shot in the forehead with a .32 revolver, at 11:20 a.m., twenty days after Chester has been killed and within five minutes of the time Ada phones him from the District Attorney’s office.
There is no look of horror or surprise on Rex’s face, as was the case with Julia and Chester.
His body is found on the floor before the mantel.
A diagram which Ada asked him to bring with him to the District Attorney’s office has disappeared.
No one upstairs hears the shot, though the doors are open; but Sproot, downstairs in the butler’s pantry, hears it distinctly.
Von Blon is visiting Sibella that morning; but she says she was in the bathroom bathing her dog at the time Rex was shot.
Footprints are found in Ada’s room coming from the balcony door, which is ajar.
A single set of footprints is found leading from the front walk to the balcony.
The tracks could have been made at any time after nine o’clock that morning.
Sibella refuses to go away on a visit.
The galoshes that made all three sets of footprints are found in the linen-closet, although they were not there when the house was searched for the revolver.
The galoshes are returned to the linen-closet, but disappear that night.