Book 6 in The Young Underground series. Peter and Elise travel to Copenhagen at the invitation of King Christian. Suspicious of a German man's interest in an antique key, Peter uncovers an assassination plot!
- ISBN10 1556616597
- ISBN13 9781556616594
- Publish Date 1 November 1996 (first published 1 October 1996)
- 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
- Format Paperback
- Pages 176
- Language English