Then he went to the door. He took the "Please don't disturb" notice off the inside handle; hung it on the outside of the door. He walked along the corridor; down the stairs for five floors. On the first floor he walked to the end of one of the long passage-ways. There was no one in the corridor. Isles opened the window at the end of the passage; stepped out on to the fire escape.
A minute later he was walking down a narrow street at the back of the hotel. He took Carno's licence from his pocket; found that his office address was 235 Greenacre Building, Palm Avenue. At the end of the street he found himself in a wider boulevard. He stopped a passing taxicab; told the driver to drive to the Greenacre Building.
INSIDE THE cab Isles sat back in the corner. With the aid of the strip of mirror
