On a chance that it might become necessary to operate at
greater depths--either in searching for the lost missile or in shadowing
the enemy--Tom also assigned Arv Hanson the job of rigging the _Sea
Hound_ and another seacopter with his new inventions.
Four crewmen volunteered for the cruise. When the jetmarine was ready,
Tom and Bud exchanged tight handshakes.
"Good luck!"
"Thanks, Tom."
The young inventor waved as Bud disappeared down the hatch. As soon as
the craft had submerged, Tom went back to Shopton. That evening the
Swifts were enjoying a quiet dinner at home when a loud, growling buzz
shattered their mealtime conversation.
"Oh!" Sandy gasped. "The burglar alarm!"
The Swifts' house and grounds were protected by a secret magnetic field.
Any intruder breaking the barrier touched off the automatic alarm
system. To avoid the buzzing, the family and their close friends wore
wrist watches containing tiny neutralizer coils.
"I'll see who it is," Tom said, and hurried to the door, feeling a
twinge of apprehension.
_Was this a new attempt by Brungarian agents?_
He switched on the porch light and peered out cautiously through the
one-way glass pane in the door. A slim, hatless figure in a dark suit
was just coming up the steps. Tom gave a smile of relief.
It was Harlan Ames!
"Hi, Harlan!" Tom opened the door before Ames had a chance to ring the
doorbell.
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