The latter, distrustful of the ability of the county police to bring such an atrocious murderer to Justice, had begged the help of Scotland Yard, with the result that Superintendent Merrington and his assistants appeared at the moat-house in the early morning before the astonished eyes of Caldew, who was taking a walk in the moat-house garden after a night of fruitless investigations.
In the arrival of Merrington, Caldew saw all his fine hopes of promotion dashed to the ground.

He was by no means confident that Merrington would permit him to take any further share in the investigations, but he was quite certain that if he did, and the murderer was captured through their joint efforts, very little of the credit would fall to his share when such a famous detective as Merrington was connected with the case.
Merrington would see to that.
Caldew, in his narration of the facts of the murder, laid emphasis on the mysterious nature of the crime, in the hope that Merrington might deem it wiser to return to London and leave him in charge of the case, rather than risk a failure which would greatly damage his own reputation.

Merrington listened to him gloomily.

He fully realized the difficult task ahead of the police, and his temper was not improved in consequence.
"Apparently the murderer has got clean away without leaving a trace behind him ?" he said.
"Yes." "No sign of any weapon ?" "No." "Anything taken ?" "No.

Miss Heredith says nothing was taken from the room, and nothing is missing from the house." "The motive was not robbery then," remarked Captain Stanhill.
"It may have been," responded Merrington.