Haddix, Margaret Peterson. 2003. Among the Barons.
The fourth in the Shadow Children series, Luke (aka Lee Grant) returns as our narrator. Still at Hendricks School for Troubled Boys, Lee (also called ‘L’) is making great progress with the shadow children. He is trying to teach them how to cope in the world. He’s even coaxed some of them to take their first steps outside. But life still isn’t easy. Especially when Luke learns that Lee Grant’s real brother--Smits--is coming to the school. How will his ‘brother’ treat him? Is he there to threaten him? torture him? tease him? Luke doesn’t know what to expect...but he certainly doesn’t expect to be plunged into a dangerous new world where he’s forced to interact with barons and pass himself off as Lee to the elite society of the Grants. Danger is a constant threat when you’re a third...and change seems to be constant.