Among the Imposters by Margaret Peterson Haddix
Luke Garner has come out of hiding and is now attending Hendrick's School for Boys under the identity of Lee Grant. Lee Grant was a Baron who died mysteriously in a ski accident. When Lee's brother, Smits, come to visit his "brother", will he keep Luke's secret?
Smits' strange bodyguard, Oscar, always follows Smits around and will not even leave him in the lunch room. Can Luke trust them both, or will one betray him?
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**Book 2 in the Shadow Children Sequence**
Previous book: Among the Hidden
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