The Troupe by Robert Jackson Bennett

Vaudeville: mad, mercenary, dreamy, and absurd, a world of clashing cultures and ferocious showmanship and wickedly delightful deceptions.

But sixteen-year-old pianist George Carole has joined vaudeville for one reason only: to find the man he suspects to be his father, the great Heironomo Silenus. Yet as he chases down his father's troupe, he begins to understand that their performances are strange even for vaudeville: for wherever they happen to tour, the very nature of the world seems to change.

Because there is a secret within Silenus's show so ancient and dangerous that it has won him many powerful enemies. And it's not until after he joins them that George realizes the troupe is not simply touring: they are running for their lives.

And soon...he is as well.