Don't Say We Didn't Warn You'When the Juvenile Transportation Services come for you in the night in a preordained kidnapping, complete with an unmarked van and husky guardsmen you can't outmatch, you have been sold for a promise.'' A young woman thinks she hasescaped her past only to discover that she's been hovering on its edges all along: She and her younger sister bide their time in a dilapidated warehouse in a desolate town north of New York City; their parents settled there