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A
campaign of fierce explosive blasts terrorizes Swift Enterprises, targeting the
family and friends of Tom Swift. To withstand and outwit the vengeful enemy,
Tom and his friends Bud Barclay and Chow Winkler seek secret refuge on
Spindrift Island, home of another young scientific adventurer, none other than
Rick Brant! On Spindrift Tom tests a remarkable new invention, the amplitensor,
in his aquadisk, a multi-mach watercraft of unique design. But the vital work
is overshadowed by fear for the life of Tom's cousin Ed Longstreet, who has
been made captive by Tom's mad adversary. With Rick and his pal Scotty
providing their usual clever detective work, a daring and intricate plan is
developed to rescue Ed by entering the aquadisk in an international sea race.
But will Tom and his comrades defeat the Blast-Master -- before time runs out?