He lifted his voice in a sudden shout.
"Jan!" he cried. "Jan!"
And then Dick's heart sank. That must be meant for Steve—and to answer meant deadly peril for Stepan Dushan, since the spy, who had so plainly been betraying Servian secrets to Hallo, knew Stepan. Dick edged forward, waiting, wondering. Now he caught a glimpse of the spy, and then he drew back, as he saw that both Hallo and the other man had come very close to him. They stood just by the box that sheltered him.
"Jan!" cried Hallo again.
"Here I am!" said Stepan's voice. And then, "Serge!"
"Stepan Dushan! That is Stepan Dushan!" shrieked the spy.
Then, before anything more could happen, Dick had an inspiration. He threw his whole weight against the heavy packing case, straining, pushing. It trembled, gave, and then crashed down, bearing Hallo and the spy down beneath its crushing weight, sending them down, stunned and helpless.