New York : G.P. Putnam's Sons, 2005, c2004.
1st American ed.
217 p. : ill., map ; 22 cm.
"Published in Great Britain in 2004 by Faber Limited, London"--T.p. verso.
Eleven-year-old Sam finds himself involved in a dangerous adventure when he and his new friends, brother and sister Ben and Zara, set off for the Arctic to try and rescue the siblings' great-uncle and five other professors from the mad scientist holding them prisoner.
Seven professors of the Far North