News of Peter and Elise Andersen's latest adventure has traveled fast - all the way from Helsingor to Copenhagen and King Christian. The twins are thrilled when the well-loved Danish monarch invites them to visit him at his palace. But on the train to Copenhagen, Peter and Elise have a frightening run-in with a gruff German who is extremely protective of his travel bag - and its curious-looking contents. Soon, the mysterious man begins to show up everywhere the Andersens go. The German' s keen interest in an antique key Peter finds adds to his suspicions about the man's motives. What can he possibly be up to? Convinced the German is a threat, Peter turns spy and discovers that King Christian may be in danger! But will Peter and Elise be able to warn him in time?
Used availability for Robert Elmer's A Light in the Castle
October 1996 : USA Library Binding
October 1996 : USA Paperback
January 2012 : USA, Canada, UK Kindle edition