In less than a minute he saw the stranger coming down the stairs from the upper cabin.
He was still walking slowly, and peering sharply at the passengers.
When he had come as far as the door, he halted and looked through the glass.
The detective could see his face.
He saw the man’s brow wrinkle first when he perceived that somebody was standing alone by the rail.
Then his lips were pressed hard together, and he nodded as if satisfied.
Evidently he had recognized Snell.
For a moment longer he stood there, hesitating, perhaps.
Then he gave a side glance at Patsy, who sat so close that they almost touched each other.