An explosion at a traffic stop puts Sherlock and Joan on two separate tracks of investigation as they try to determine whether the attack was gang-related or a terrorist attack. Sherlock and Joan suspect there is more for them to discover regarding the recent attack on someone within their inner circle.

While investigating the murder of Eleanor Barba, a chef at a high-end restaurant, Liv consumes her brain and becomes an unrelenting perfectionist who knows just how to break a person to their very core. Meanwhile, Major is on a mission to find out who is betraying the commander.

As Jessica focuses on helping the helpless, Dorothy Walker shows up at Alias to beg for help finding a missing Trish.

Tensions run high between Jessica and Trish as Trish hones her new catlike skills and scours the city for a chance to be a hero.

Itching to get back out on the streets and find her attacker, Jessica defies her doctor's advice. Jeri reconnects with her college flame Kith.

Jessica learns there's more to Erik then meets the eye as they track down three potential attackers. Malcolm digs up dirt on Kith's husband.

Teaming up with Trish to stake out Sallinger, Jessica makes a startling discovery. Jeri's plot to expose Peter yields unexpected consequences.

As the police sift through the gruesome crime scene, Jessica and Trish race to find Sallinger's latest captive.

Jessica and Trish go on a road trip to dig into Sallinger's past and unearth a horrifying discovery.

When Sallinger posts a video teasing his next crime, Jessica responds with her own media play. Jeri demands that Malcolm identify the masked woman.

After a shocking blow, Jessica's forced to choose between protecting Trish and destroying Sallinger. Jeri seizes a chance to get back in Kith's life.

Jessica wrestles with her emotions as she tries to untangle herself from a murder investigation.

Trish revisits her troubled childhood with Dorothy while plotting to stop Sallinger and stamp out evil across the city.

As Trish makes a move on Sallinger, Jessica intervenes -- and ends up caught in a harrowing dance with the killer.

An old friends visit Jessica as she sets out on an agonizing mission and learns the true cost of being a hero.

Dara Ó Briain and Hugh Dennis discuss the events of the week in the company of guests Glen Moore, Ed Gamble, Kerry Godliman, Milton Jones and Rachel Parris.

Teresa's deal with a smuggler goes sieways when a local kingpin discovers she's smuggling cocaine.

Actress Sienna Miller; actor Josh Charles; singer-songwriter Ryan Tedder; OneRepublic performs.