“Tonight. Eleven. Watch Chinaman. Back street. Here.”

Loy Rook walked into the office shortly after Harry had hung up the telephone. That meant nothing.

Harry made occasional personal calls from the office. He was quite positive that his disconnected conversation could have aroused no suspicion in Loy Rook.

EVENING arrived. Loy Rook invited Harry to dinner in the third-floor apartment. They dined in a room filled with beautiful Oriental hangings, waited upon by Loy Rook’s Chinese servants. Harry went downstairs at ten o’clock.

He waited patiently until eleven. Then he stepped into the hallway and pushed the bottom of the bookcase. The sections opened. Harry retired to his room.

His work was finished. Loy Rook had said nothing about closing the bookcase. Harry listened in darkness. Fifteen minutes later, he heard stealthy footsteps descending stairs. Luke Froy was leaving.

Harry stared from the dark window. He fancied he saw a dim form in the back street. He followed its course, and distinctly observed a man of Luke Froy’s height appear at the corner. Harry still watched.

He thought he saw a patch of darkness flit along the sidewalk. That was all. It was enough. Harry Vincent knew that The Shadow was on the trail of Luke Froy!

CHAPTER XVI. TWO MEN TRAPPED

SNEAKS RUBIN was obeying his master’s instructions. He had become conspicuous in the underworld. Sneaks was a well-known character, but he usually kept to himself. Now he was traveling the rounds.