S9 E14: Abby is distraught upon learning that her emotionally troubled brother has gone missing while piloting an airplane. Desperate Romano receives some depressing news. The emergency room is inundated with numerous teenage girls who were run over by a fellow female student who suffers from a rare disease that may have caused the tragedy. Meanwhile, Chen's relationship with Pratt changes radically. A daughter wants to take extreme measures to keep her elderly mother alive. Weaver gets a promotion from grateful alderman John Bright (recurring guest star BRUCE WEITZ). And Lewis ponders her pending date with a handsome man.