Mr. Briggerland, killing time on the quay at Monaco, saw the _Jungle Queen_ come into harbour and watched Marcus land, carrying his lines in his hand.

As Marcus came abreast of him he called and Mr. Stepney looked round with a start.

"Hello, Briggerland," he said, swallowing something.

"Well, have you been fishing?" asked Mr. Briggerland in his most paternal manner.

"Yes," admitted Marcus.

"Did you catch anything?"

Stepney nodded.

"Only one," he said.

"Hard luck," said Mr. Briggerland, with a smile, "but where is Mrs. Meredith--I understood she was going out with you to-day?"

"She went to San Remo," said Stepney shortly, and the other nodded.

"To be sure," he said. "I had forgotten that."

Later he bought a copy of the _Nicoise_ and learnt of the tragedy on the San Remo road. It brought him back to the house, a visibly agitated man.

"This is shocking news, my dear," he panted into the saloon and stood stock still at the sight of Mr. Jack Glover.

"Come in, Briggerland," said Jack, without ceremony. There was a man with him, a tall, keen Frenchman whom Briggerland recognised as the chief detective of the Prefecture. "We want you to give an account of your actions."

"My actions?" said Mr. Briggerland indignantly. "Do you associate me with this dreadful tragedy? A tragedy," he said, "which has stricken me almost dumb with horror and remorse. Why did I ever allow that villain even to speak to poor Lydia?"

"Nevertheless, m'sieur," said the tall man quietly, "you must tell us where you have been."

"That is easily explained. I went to San Remo."

"By road?"

"Yes, by road," said Mr. Briggerland, "on my motor-bicycle."

"What time did you arrive in San Remo?"

"At midday, or it may have been a quarter of an hour before."

"You know that the murder must have been committed at half-past eleven?" said Jack.

"So the newspapers tell me."

"Where did you go in San Remo?" asked the detective.

"I went to a cafe and had a glass of wine, then I strolled about the town and lunched at the Victoria. I caught the one o'clock train to Monte Carlo."

"Did you hear nothing of the murder?"

"Not a word," said Mr. Briggerland, "not a word."

"Did you see the car?"

Mr. Briggerland shook his head.

"I left some time before poor Lydia," he said softly.

"Did you know of any attachment between the chauffeur and your guest?"

"I had no idea such a thing existed. If I had," said Mr. Briggerland virtuously, "I should have taken immediate steps to have brought poor Lydia to her senses."

"Your daughter says that they were frequently together. Did you notice this?"

"Yes, I did notice it, but my daughter and I are very democratic. We have made a friend of Mordon and I suppose what would have seemed familiar to you, would pass unnoticed with us. Yes, I certainly do remember my poor friend and Mordon walking together in the garden."

"Is this yours?" The detective took from behind a curtain an old British rifle.

"Yes, that is mine," admitted Briggerland without a moment's hesitation. "It is one I bought in Amiens, a souvenir of our gallant soldiers----"

"I know, I quite understand your patriotic motive in purchasing it," said the detective dryly, "but will you tell us how this passed from your possession."

"I haven't the slightest notion," said Mr. Briggerland in surprise. "I had no idea it was lost--I'd lost sight of it for some weeks. Can it be that Mordon--but no, I must not think so evilly of him."

"What were you going to suggest?" asked Jack. "That Mordon fired at Mrs. Meredith when she was on the swimming raft? If you are, I can save you the trouble of telling that lie. It was you who fired, and it was I who knocked you out."

Mr. Briggerland's face was a study.

"I can't understand why you make such a wild and unfounded charge," he said gently. "Perhaps, my dear, you could elucidate this mystery."

Jean had not spoken since he entered. She sat bolt upright on a chair, her hands folded in her lap, her sad eyes fixed now upon Jack, now upon the detective. She shook her head.

"I know nothing about the rifle, and did not even know you possessed one," she said. "But please answer all their questions, father. I am as anxious as you are to get to the bottom of this dreadful tragedy. Have you told my father about the letters which were discovered?"

The detective shook his head.

"I have not seen your father until he arrived this moment," he said.

"Letters?" Mr. Briggerland looked at his daughter. "Did poor Lydia leave a letter?"

She nodded.

"I think Mr. Glover will tell you, father," she said. "Poor Lydia had an attachment for Mordon. It is very clear what happened. They went out to-day, never intending to return----"

"Mrs. Meredith had no intention of going to the Lovers' Chair until you suggested the trip to her," said Jack quietly. "Mrs. Cole-Mortimer is very emphatic on that point."

"Has the body been found?" asked Mr. Briggerland.

"Nothing has been found but the chauffeur," said the detective.

After a few more questions he took Jack outside.

"It looks very much to me as though it were one of those crimes of passion which are so frequent in this country," he said. "Mordon was a Frenchman and I have been able to identify him by tattoo marks on his arm, as a man who has been in the hands of the police many times."

"You think there is no hope?"

The detective shrugged h............