An American boy living in Austria, Constantine is bored until he learns that Vienna is a center of international intrigue. Anxious to find a spy, he and his friends uncover a mystery that leads back to the Holocaust. Book 1, Passport to Danger.
- ISBN10 1556615493
- ISBN13 9781556615498
- Publish Date 1 May 1999 (first published 1 March 1995)
- Publish Status Out of Print
- Out of Print 22 May 2009
- Publish Country US
- Publisher Baker Publishing Group
- Imprint Bethany House Publishers, a division of Baker Publishing Group
- Edition Revised edition
- Format Paperback
- Pages 201
- Language English