The Fellowship of the Frog by Edgar Wallace

Heron's club had been temporarily closed by order of the police, but now was allowed to open its doors again. Ray invariably lunched at Heron's unless he was taking the meal with Lola, who preferred a brighter atmosphere than the club offered at midday.

Only a few tables were occupied when he arrived. The stigma of the police raid lay upon Heron's, 'and its more cautious clients had not yet begun to drift back. It was fairly well known that something had happened to Hagn, the manager, for the man had not appeared since the night of the raid. There were unconfirmed rumours of his arrest. Ray had not troubled to call for letters as he passed through the hall, for very little correspondence came to him at the club. He was therefore surprised when the waiter, having taken his order, returned, accompanied by the clerk carrying in his hand two letters, one heavily sealed and weighty, the other smaller.