Kayton made no further attempt to stop her.
After her departure he stood still, lost in thought.
Everything was clear as daylight now. Both
Bruce and Mary were innocent. No inmate of the
house had committed the murder. The midnight
assassin was not a burglar or any ordinary criminal.
It was some one with whom Mr. Argyle was well
acquainted, some one he knew well enough to invite
to his house at such a late hour as one o'clock in the
morning. It might be some one with whom he had
business dealings and who considered himself wronged.
The person had come to the house to demand an
explanation or redress, and a heated argument had
followed. Miss Masuret was sure she heard voices
raised in angry dispute. No doubt they quarreled,
and the stranger, losing self-control, killed his host.
Certainly it was as plausible a theory as any other.
