Did the cabman know the daughter?
Oh yes, he had seen the young lady once or twice, but "She don't come very often," he explained.
"By all accounts she doesn't get on with her father." "Her father?
I did not know she had a father," said Tarling in surprise.
Yes, there was a father.

He was an infrequent visitor, and usually came up from London by the late train and was driven in his own brougham to the house.

He had not seen him--indeed, very few people had, but by all accounts he was a very nice man, and well-connected in the City.
Tarling had telegraphed to the assistant who had been placed at his disposal by Scotland Yard, and Detective-Inspector Whiteside was waiting for him at the station.
"Any fresh news ?" asked Tarling.
"Yes, sir, there's rather an important clue come to light," said Whiteside.

"I've got the car here, sir, and we might discuss it on the way back to the Yard." "What is it ?" asked Tarling.
"We got it from Mr.Lyne's manservant," said the inspector.

"It appears that the butler had been going through Mr.Lyne's things, acting on instructions from headquarters, and in a corner of his writing-desk a telegram was discovered.