Last show of the series.
Spenser interviews a serial killer who had confessed to murdering the missing girl 12 years earlier. The killer now says she and her husband had falsely confessed to the girl's murder (in fact, she is still alive) to give themselves an alibi for a murder they committed in New Hampshire, which has the death penalty. However, no one has been sentenced to death in New Hampshire since the state resumed capital punishment in the 1970s.