“Who owns this block?” asked the detective.

“This is one of Maitland’s properties—Maitlands Consolidated. He’s got the Prince of Caux’s house in Berkeley Square and——”

“Don’t worry about giving me his family history. What time did Miss Bassano come in?”

“She’s been in all the evening—since eleven.”

“Anybody with her?”

The man hesitated.

“Mr. Maitland came in with her, but he went soon after.”

“Nobody else?”

“Nobody except Mr. Maitland.”

“Give me your master-key.”