A face from the past haunts Lincoln on his execution day; Veronica raises the dead to prove Lincoln's innocence.
Alicia and Will deal with their growing sexual tension and Diane and Kurt McVeigh continue their flirtation. At the same time, Alicia defends a college student accused of killing her sorority sister while under the influence of a sleep aid.
Joan discovers an unsolved murder connected to a rare prehistoric fossil when she reviews one of Sherlock's cold cases; Sherlock's responsibilities as a sobriety sponsor cross personal boundaries.