“I must walk a bit, I think. I feel so excited. Drop me in the park, will you? Unless you’d like to come too?”

“I want to get some petrol,” he explained. “And send off a cable or two.”

“All right. I’ll meet you at the Ritz at seven. We’ll have to dine upstairs. I can’t show myself in these glad rags.”

“Sure. I’ll get Felix help me choose the menu. He’s some head waiter, that. So long.”

Tuppence walked briskly along towards the Serpentine, first glancing at her watch. It was nearly six o’clock. She remembered that she had had no tea, but felt too excited to be conscious of hunger. She walked as far as Kensington Gardens and then slowly retraced her steps, feeling infinitely better for the fresh air and exercise. It was not so easy to follow Sir James’s advice, and put the possible events of the evening out of her head. As she drew nearer and nearer to Hyde Park corner, the temptation to return to South Audley Mansions was almost irresistible.

At any rate, she decided, it would do no harm just to go and look at the building. Perhaps, then, she could resign herself to waiting patiently for ten o’clock.

South Audley Mansions looked exactly the same as usual. What Tuppence had expected she hardly knew, but the sight of its red brick stolidity slightly assuaged the growing and entirely unreasonable uneasiness that possessed her. She was just turning away when she heard a piercing whistle, and the faithful Albert came running from the building to join her.

Tuppence frowned. It was no part of the programme to have attention called to her presence in the neighbourhood, but Albert was purple with suppressed excitement.

“I say, miss, she’s a-going!”

“Who’s going?” demanded Tuppence sharply.