This is the first episode of a two-part "crossover," to be concluded on ER's sister series Third Watch on April 29, 2002. After getting a disturbing phone call from her sister, Chloe (Kathleen Wilhoite), Susan Lewis (Sherry Stringfield) flies to New York, desperately hoping to locate both Chloe and Chloe's daughter, Suzie. Lewis enlist the aid of several Third Watch regulars, including police officers Faith Yokas (Molly Price) and "Bosco" Boscorelli (Jason Wiles), and paramedics Alex Taylor (Amy Carlson) and Kim Zambrano (Kim Raver). Back in Chicago, Abby (Maura Tierney) starts drinking again; Pratt (Mekhi Phifer) tries to make time with Chen (Ming-Na); and Elizabeth (Alex Kingston) considers staying with Greene (Anthony Edwards) during his final days. ~ Hal Erickson, Rovi