Neela is upset after she finds out the aorta surgery on Sheryl Hawkins (recurring guest star AIDA TURTURRO) has caused an infection. While treating a severely beaten Korean teen, Abby discovers an even more serious condition. Kovac (former series star GORAN VISNJIC) struggles to forgive Abby for her indiscretion. & Dr. Brenner (recurring guest star DAVID LYONS) continues to ruffle feathers in the ER.