The fact that she had good Italian blood in her veins was very present in his mind.
Again, it would be a matter of sudden impulse, not of grave deliberation.
The irritating sound of Lord Loudwater's snores and the sight of the gleaming knife-blade on the library table coming together after their painful and moving discussion of their dangers might awake the impulse to be rid of him, at any cost, in full strength.

He was not disposed to underrate the suggestion of that naked knife-blade on them when they were strung to such a height of emotion.

Again, he asked himself, had either of them murdered Lord Loudwater to save the other?
At any rate, they knew who had committed the murder.

Of that he was sure.
Could they be shielding a third person?
If so, who was that third person?
.