A routine day filled with ordinary traumas becomes nightmarish when a distracted Mark critically misdiagnoses a pregnant woman's delivery complication. A teenager is brought in after being accidentally poisoned. Benton grapples with his own demons in the wake of his mother's collapse.

Deb and Carter compete furiously for procedures after Benton tells them their books are due a week earlier than previously announced. Deb commits a nearly deadly error on a patient while trying to keep up with Carter. Doug's relationship with Diane Leeds progresses. Benton and Jackie decide to put their mother in a home. Mark is put on trial, so to speak, in the M&M conference regarding Jodi O'Brien's case. Chloe returns