Even supposing Miss Loach had been murdered out of a long-delayed revenge by a member of the Saul family--and that theory appeared ridiculous to Mallow--the question was how did the assassin escape?
Certainly, having regard to the cards still being on the lap of the deceased, and the closing of the door at a time when the policeman was not in the vicinity, the assassin may have escaped in that way.

But how did he come to be hidden in the bedroom, and how did he kill the old lady before she had time to call out or even rise, seeing that he had the whole length of the room to cross before reaching her?
And again, the escape of the assassin at this hour did not explain the ringing of the bell.

Cuthbert was deeply interested, and wondered if the mystery would ever be solved.

"I must see Jennings after all," he thought as the train steamed into Paddington.
And see Jennings he did, sooner than he expected.

That same evening when he was dressing to go out, a card was brought.