All of the stuff here is great for ideas.
I've just started planning for my Winter camp and it's going to be along the lines of Spy/Detective or Mystery theme.
I'll attach the murder hunt materials for anyone interested.
It basically consists of:
1. Anagrams: directs the students to a teacher (make your own at
http://www.easypeasy.com/anagrams/)
2. Sentence clue jigsaw: directs students to a place (jigsaw template attached. we laminated it and cut out the pieces)
3. Playing cards: The kids run to the place directed to by the jigsaw and find all the playing cards.
4. Interviews: Students have to ask the teachers some questions relating to the murder.
5. Fingerprints: Students are given paper with all the teachers' fingerprints on, labeled. They need to go to the room where the murder happened (perhaps identified in part 2) and label on the map their locations.
6. Final clue: Students assemble a ripped up note to find out the exact location of the murder and deduce who did it by looking at their fingerprint clue.