Marcus Ho

Sherlock and Joan search for a murderer who used poisonous mushrooms to kill a botany professor and a group of the instructor's students. Also, when Joan is disturbed by loud noise next door, she discovers her neighbor, Trent (Richard Kind), is renting out his home through a vacation site that caters to hard pratiers.

The mysterious criminal mastermind known as “The Voice” returns, trapping Reese and Fusco in their own precinct with several armed gang members and the latest POI. Also, Root makes a shocking discovery.

As Bull assists a man facing vehicular manslaughter charges, he uncovers a connection between his client's trial and a corrupt state assemblyman who would greatly benefit from a guilty verdict. Also, Danny and Cable team up to investigate why Marissa is suddenly acting and dressing differently.

When Alicia and Dean represent a fired female CEO in a sex discrimination suit against her company, they face a tough defense team in familiar foes Elsbeth Tascioni and Rayna Hecht. Meanwhile, a hacker seizes control and threatens to delete all of Florrick/Agos/Lockhart's files, sending the firm into panic mode when he demands a ransom. Carrie Preston and Jill Hennessy guest star.

Goren and Eames investigate the suspicious suicide of a successful Wall Street banker.