Book 1

Secret of the Mezuzah

by Mary Reeves Bell

Published 1 March 1995
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.

Book 1

The Secret of Mezuzah

by Mary Reeves Bell

Published 1 January 1999

Book 2

The Sagebrush Rebellion

by Mary Reeves Bell

Published 7 January 1999
Book 2 in Passport to Danger. Having left Austria for summer vacation in Wyoming, Constantine hopes the time with his grandparents will be relaxing. But when someone sabotages the ranch's cattle, it's up to Con to find the culprit.

Book 3

Book 3 in the Passport to Danger! series finds Con and Hannah headed to Romania to visit her uncle. Their trip turns dangerous, though, when they undertake an investigation that sets them against a neo-Nazi movement.