Kurt McVeigh, the right-wing ballistics expert with whom Diane has an on-again off-again relationship, is on trial for testimony he gave in a murder trial. Pablo Beltran, the accused cop killer in that case, was sent to prison partially on the back of McVeigh's testimony. When extreme misconduct from the DNA lab caused Beltran to go free, however, he decided to go after McVeigh knowing that a judgment against the expert would end his career. As Eli decides how best to use a "Nannygate"-style political bombshell that could cripple Wendy Scott-Carr's campaign, Alicia helps Diane defend McVeigh and piece together the truth about Beltran's shooting.