A ransomware attack paralyses the city by disrupting the entire power grid. The team investigate the attack, while Sam struggles in the wake of his wife's death to find a way for his family to celebrate the holidays.
Mark is forced to prosecute his childhood icon, Samara Strong, an '80s Hollywood star accused of murdering her husband 30 years ago; Judge Laski is presiding over cases while Lola is on maternity leave.
Tanner decides to use a crowdsourcing platform to try and solve a murder case, as a user provides vital information that could lead to the killer.
