What's a good Christian devo book for teens?

I've been looking, but i'm not really sure...What's a good Christian devo book for teens?
Devo = christian?



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The Hidden Verses - online - free. (Questions and answers from the Old King James Bible.)

http://thehiddenverses.blogspot.com

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What in the world is going on, by David Jeramiah.



It's time for Christian teens to get serious and figure out what God wants them to do.

This is not a time for teens to rely on feel good Christianity. These are serious times we are living in and possibly the time we will see with our eyes Christ's return.




My Utmost For His Highest by Oswald Chambers is one of the alltime classic devotionals for Christians of all ages.



It is available free online at:http://www.myutmost.org/What's a good Christian devo book for teens?
whats devo?