The episode opens in a poker game. When it is interrupted by incoming wounded, Hawkeye and Margaret operate on a patient and Hawkeye insults Frank.
While pondering the case outside the supply tent, Hawkeye encounters Margaret and she theorizes that they made a mistake during surgery, eliciting extreme doubt from Hawkeye, who in turn insults her. During the night, Hawkeye has an epiphany and reopens the patient to find a small piece of shrapnel damage behind the sigmoid colon, at which point Frank states that "anybody could have missed that."