Magic Tree House: Night of the new magicians /
by Mary Pope Osborne ; illustrated by Sal Murdocca.
- New York : Random House, c2006.
- 111 p. : ill. ; 22 cm.
- Magic tree house ; #35 .
"A Merlin mission." "A Stepping Stone book."
Jack and Annie visit the Paris World's Fair of 1889 in an effort to protect four scientific pioneers from an evil sorcerer.