She took the envelope, glanced at it and put it in her bag. It didn't seem to interest her particularly.
She put out her hand again. He held it.
"If—" she began, and broke off raggedly.
"If what?" he asked.
She bit her lip.
"No," she said. "It wouldn't be any good. There's always the But."
"I'll buy it," said the Saint patiently. "What's the answer?"
She smiled at him rather wistfully.
"There isn't any answer. One just thinks, ' If something or other,' and then one thinks, 'But something else,' which makes it impossible," she explained lucidly. "As a matter of fact, I was thinking that you and I would make a marvellous combination."
"And why not?"