The Unsolved Murder of Beverly Lynn Smith (2022)

S5E13 Over a Barrel

A man seizes several hostages, including Joan, and threatens to kill them if Holmes doesn't uncover who is behind his son's death. As Sherlock delves into the case, the kidnapper sets a deadline of 16 hours for him to identify the culprit, warning that time is running out before the statute of limitations expires on the crime.