“What’s the line up?” he asked. “Remember, I’m still in the dark.”
“Everything is working out beautifully,” she informed, “Enid has agreed that I may go to Cedar Point with her. This afternoon I induced her to wrap the Zudi Drum—rather I did it myself. I intend to substitute this package for it, and you must keep her out here on deck while I make the exchange.”
“And after that?”
“I think Enid plans to leave here about nine or ten o’clock. What I want you to do is to follow in your amphibian. Take care she doesn’t suspect, of course. When she leaves the boat at Cedar Point, I’ll trail her. If the kidnappers release her father as they promised, all well and good. If things go wrong as I suspect they may, I’ll race back to shore and send up a rocket which will be the signal for you to go for help as quickly as you can.”
“Sounds OK if it works out as planned.”
“We must trust to luck.”
“How am I to follow without Enid suspecting? If she sees my amphibian around here she may guess what is up.”
“Why not lie in toward shore? If you’re watching closely you will be able to see our boat start away. I’ll make sure that the lights are burning. Keep far enough back so the kidnappers won’t be alarmed.”
“Trust me,” Rex promised, “if I see your rocket go up, I’ll have the police there in two jerks.”
There was no time for further discussion of the plan, for the sound of footsteps warned them that Enid was approaching. Madge hastily ducked into a companionway with her package. Rex maneuvered Enid to another part of the vessel, giving her an opportunity to slip from her hiding place. She hurried to the cabin where the Zudi Drum was secreted and made the exchange. For a minute she was puzzled to think of another hiding place for the Zudi Drum.