"Collector of Port, N.Y.: Swear out warrant for arrest of Clara La Croix, charge of smuggling, and mail at once to International, Niagara Falls. Brady."
The second was addressed to the Customs department at Suspension Bridge, saying:
"Keep watch for La Croix, wife and daughter with four spies. Are going to attempt to pass $250,000 worth of diamonds."
As La Croix was well known, details were useless.
The Bradys watched their quarry closely.
Knowing they had those diamonds with them, and that they would very likely play a sharp trick to evade the inspectors, the Bradys were very careful.
Scarcely a move made by the family escaped them.
It soon became apparent to the detectives that an important move was soon to be made, for the four spies were in frequent consultation with the Frenchman and his family.
"They are evidently arranging a plan of action," Harry commented, as he and his partner traced the men to La Croix's room for the fourth time.
"I wish there was some way of getting a clew to their design," Old King Brady replied, in wistful tones. "We are completely in the dark."