Something in his tone made Tuppence glance up sharply.  He shook his head with a smile.

“No, I shan’t say any more.  Great mistake to say too much.  Remember that.  Never tell all you know—­not even to the person you know best.  Understand?  Good-bye.”

He strode away.  Tuppence stared after him.  She was beginning to understand Sir James’s methods.  Once before he had thrown her a hint in the same careless fashion.  Was this a hint?  What exactly lay behind those last brief words?  Did he mean that, after all, he had not abandoned the case; that, secretly, he would be working on it still while——­

Her meditations were interrupted by Julius, who adjured her to “get right in.”

“You’re looking kind of thoughtful,” he remarked as they started off.  “Did the old guy say anything more?”

Tuppence opened her mouth impulsively, and then shut it again.  Sir James’s words sounded in her ears:  “Never tell all you know—­not even to the person you know best.”  And like a flash there came into her mind another memory.  Julius before the safe in the flat, her own question and the pause before his reply, “Nothing.”  Was there really nothing?  Or had he found something he wished to keep to himself?  If he could make a reservation, so could she.

“Nothing particular,” she replied.

She felt rather than saw Julius throw a sideways glance at her.

“Say, shall we go for a spin in the park?”

“If you like.”

For a while they ran on under the trees in silence.  It was a beautiful day.  The keen rush through the air brought a new exhilaration to Tuppence.

“Say, Miss Tuppence, do you think I’m ever going to find Jane?”

Julius spoke in a discouraged voice.  The mood was so alien to him that Tuppence turned and stared at him in surprise.  He nodded.

“That’s so.  I’m getting down and out over the business.  Sir James to-day hadn’t got any hope at all, I could see that.  I don’t like him—­we don’t gee together somehow—­but he’s pretty cute, and I guess he wouldn’t quit if there was any chance of success—­now, would he?”

Tuppence felt rather uncomfortable, but clinging to her belief that Julius also had withheld something from her, she remained firm.

“He suggested advertising for the nurse,” she reminded him.

“Yes, with a ‘forlorn hope’ flavour to his voice!  No—­I’m about fed up.  I’ve half a mind to go back to the States right away.”

“Oh no!” cried Tuppence.  “We’ve got to find Tommy.”

“I sure forgot Beresford,” said Julius contritely.  “That’s so.  We must find him.  But after—­well, I’ve been day-dreaming ever since I started on this trip—­and these dreams are rotten poor business.  I’m quit of them.  Say, Miss Tuppence, there’s something I’d like to ask you.”

“Yes?”

“You and Beresford.  What about it?”

“I don’t understand you,” replied Tuppence with dignity, adding rather inconsequently:  “And, anyway, you’re wrong!”