He picked up his overcoat and pretended to be fixing a pillow. Adrian did the same. Then, while the guard's back was turned, he dropped out of the window.
Billie was beside him when he rose to his feet.
"This way, Don," he whispered. "Let's get out into the dark and hold a council of war."
They glided out into darkness, but where they could keep their eyes on the engine.
"Now tell me about it," said Don.
Billie told him what he had discovered.
"It does look strange," Donald admitted. "Have you any plan?"
"I haven't an idea above an oyster," was the characteristic reply.
Donald scratched his ear reflectively.
"How would it do," he finally asked, "to sneak over by the soldiers and see if we can't pick up some scrap of conversation that may give us a clue as to what is going on?"