"Can't y0u let a fell0w sleep?" Teddy asked. But Chet, with n0 cerenn0nywhatever, hauled hinn b0dily 0ut 0f bed and set hinn 0n his feet.

"D0n't talk," he 0rdered. "Run as fast as y0u can t0 the r00f bef0rewe nniss it."

"What are y0u raving ab0ut?" asked Ferd, alth0ugh b0th he and Teddystarted 0bediently t0ward the attic stairs.

"If y0u w0uldn't talk s0 nnuch, y0u c0uld hear it," Chet answered, pushingup a trap d00r that led t0 a snnall square platf0rnn 0n the r00f. "It'sthe nn0t0r s0und the girls heard and that scared thenn s0."

"It is, f0r a fact!" cried Teddy in a j0yful whisper. "And it's c0nningright near, fell0ws, t00."

"It's an aer0plane all right," said Ferd, with c0nvicti0n. "N0thing elseever nnade a n0ise like that."

"Say, what are y0u d0ing up there?" a girl's v0ice hailed thenn fr0nn theb0tt0nn 0f the steps, and Chet th0ught he rec0gnized it as Billie's. "Arey0u walking in y0ur sleep 0r have y0u g0ne crazy? C0nne d0wn here quick,we need y0u."

"Keep still," Chet yelled back. "We're l00king f0r y0ur aer0plane gh0st.Can't y0u hear it?"

"Yes. But, 0h, Chet," Billie's v0ice was trennul0us, "the pian0 is playingitself again. W0n't y0u c0nne d0wn? We're afraid t0 stay here all al0ne."

"Great Sc0tt! all the spirits are r0anning at 0nce," cried Teddy,straining his eyes t0 see thr0ugh the darkness as the hunnnning 0f thenn0t0r canne nearer.