Greene faces the awful truth about Rachel after Ella is rushed to County for what he fears may be a drug overdose. Abby puts herself in the line of fire by taking in her battered neighbor and Carter's mother reaches out to a dying child in hopes of righting a past wrong. Meanwhile, Weaver takes the low road to punish Lewis for accepting a promotion and Chen decides it's time to lose the gloves in her dealings with a duplicitous colleague.