The secret of the underground room /
John Bellairs.
- New York : Puffin Books, 1992.
- 127 p ; 19 cm.
"First published in the United States of America by Dial books for Young Readers"--Verso t.p.
Booklist. Kirkus Review. School Library Journal.
When Father Higgins disappears, Johnny Dixon and Professor Childermass discover disturbing clues which lead them to England and an encounter with a long-dead knight.