Jaclyn pushes the idea of a vacation fling on Laurie. Chelsea finds herself in a perilous situation. Gaitok worries about a reprimand.

While retracing the Maitlands' recent family vacation in Dayton, Ohio, Holly pursues a possible connection to an eerily similar case and gains valuable insight from local former detective Andy Katcavage. Meanwhile, Glory faces increased scrutiny in her daily life.

Robin and Strike make a major breakthrough, having eliminated several suspects. Robin's cover is blown, and Strike stays the night at her new flat.

The guys receive an unexpected response when they decide to release the beta version of Pied Piper. Monica worries about how to deliver criticism. Erlich, on facing financial woes, considers a big decision, and Gavin challenges the Nucleus team to do the impossible.

Erlich struggles to come clean to Richard, who is forced to make a choice between friendship and the company's future. Jared's new Pied Piper apparel makes a splash, and divides Dinesh and Gilfoyle. As Gavin faces major life changes, the guys celebrate a rare victory.

Upon discovering some surprising stats, Richard attempts to bridge the gap between Pied Piper and its users, leading Jared to take drastic measures to hold everything together. Gavin learns secrets about the competition and decides to bring in a new face.

With Pied Piper's future in question, Erlich's publicity success leaves Richard in a moral quandary just as Dinesh's video-chat app starts to pick up speed. While Laurie prepares to jump ship, Gavin's comeback at Hooli is threatened by his displays of grandeur.

In the wake of Pied Piper's clickfarm scandal, the guys struggle to find funding for Pied Piper's video-chat app to keep up with their rapidly growing user base. Having a hard time adjusting to his company's pivot, Richard gets sage advice from an unexpected source.

Richard butts heads with Dinesh and later discovers interesting data about PiperChat's users. Erlich makes a play to be involved in Jian-Yang's new app; Jared sets ground rules with Richard; Gavin's paranoia over Jack's enthusiasm leads to a rash decision.

Richard pushes himself to the brink of sanity while trying to move ahead with his next big idea. Eyeing a comeback, Erlich pressures an uncooperative Jian-Yang. Monica sets a trap at Raviga to improve her standing with Laurie. Big Head enters the world of academia.

When Richard reaches out to an unlikely ally, Jared worries about the company he's keeping. Gilfoyle gets tough on security in the wake of Dinesh's latest dalliance. Concerned about Jian-Yang's commitment to his app, Erlich takes matters into his own hands.

Larry kicks off the new year with new rival Mocha Joe, at a cocktail party hosted by Jeff and Susie, Larry gets roped into lunch plans and has a misunderstanding with a caterer.

Larry's lawyer tries to settle the Alice situation, Larry gives Susie an extravagant gift.

Travel plans go awry when Larry brings an impromptu date to a destination wedding. At the hotel, Larry finds himself in a sticky situation when he goes searching for a toothbrush.

Larry receives a problematic gift from Freddy Funkhouser, causes trouble with Richard’s new girlfriend, and offends one of Jeff’s A-list clients.

When Susie plans a surprise party for Jeff, Larry suspects she has ulterior motives, and enlists the help of his new friend Wally to ensure things don't go awry. Larry connects with a problematic inventor to develop an innovative new product.

Larry attempts to capitalize on a friend's unexpected death and takes issue with a pattern of discrimination at a trendy restaurant. Later, Larry offers his dermatologist's son a job and Richard has a suspiciously good day on the golf course.

A prominent actor shadows Larry to prepare for an upcoming role. Larry meddles in the sale of Cheryl's sister's house, helps Leon grow a new business and stirs up trouble at a dinner party hosted by Richard's girlfriend.

Mocha Joe hatches a plan to sabotage his adversary. Larry develops a debilitating habit and takes pity on a waitress. Richard prepares for a career-defining role.

Larry runs into an unwelcome familiar face, seeks a second opinion on his knee injury and causes a rift between expectant parents.

Lyra and Will travel to a dangerous place from which no one has ever returned. Mrs. Coulter tries to thwart the Magisterium's deadly plan.

Will and Lyra journey into the Land of the Dead in search of Roger. Mrs. Coulter risks everything to save Lyra.

Lyra and Will try to escape the Land of the Dead. Asriel and Mrs. Coulter make a shocking discovery.

As war rages, Will and Lyra search for their daemons amidst the battlefield. Mrs. Coulter and Asriel challenge the ultimate enemy.

Lyra and Will reunite with Mary and hear a story that changes everything. But there is one last sacrifice they must make.

Charlotte plans the ultimate rite of passage for Rock. Che throws Miranda for a loop. Carrie finds closure.

Hoping to impress his new housemates, perpetually-insecure Jack organises an epic foam party in Room 104, but things get strange when the foam leaves the partiers with a shocking side effect.

Hoping to expose the hidden link between the Radiant Assembly's staggering debt and Charlie's ransom, Mason puts Herman Baggerly on the stand. Strickland loses track of a key witness, while Drake's detective work opens a new avenue in the case.

As Joel fights to survive, Ellie's struggle to save him stirs memories of her life in a FEDRA orphanage. Ellie recalls joining her best friend Riley for a night to remember... one that will change the course of both of their lives - and the fate of the world - forever.

Lister throws herself into furthering the Tory cause ahead of a pivotal election. Ann is stunned by her sister's move to evict their shared tenants amid growing labourer discontent. Then, as an angry mob smashes Halifax to pieces, Lister refuses to keep a low profile.

Charlotte plans the ultimate rite of passage for Rock. Che throws Miranda for a loop. Carrie finds closure.

Hoping to impress his new housemates, perpetually-insecure Jack organises an epic foam party in Room 104, but things get strange when the foam leaves the partiers with a shocking side effect.

Hoping to expose the hidden link between the Radiant Assembly's staggering debt and Charlie's ransom, Mason puts Herman Baggerly on the stand. Strickland loses track of a key witness, while Drake's detective work opens a new avenue in the case.