Wallace brings the case of a death-row inmate, Earl Slavitt, to the CIU. Earl was convicted of murdering federal prosecutor Tom Simon, one of Wallace's best friends. Simon did not believe in the death penalty, and Wallace, along with Simon's widow, want to ensure that Earl did in fact commit the crime. With only days left before the execution, the CIU team shifts into high gear, looking for possible errors in the case. Instead, they uncover cracks in Simon's reputation. Hayes and Wallace are challenged both professionally and personally, as the case draws to a stunning conclusion.