Having just won an important case, Martha Costello is given two new cases for the next day, with a chance of getting a good reference for her Silk application. Under huge time pressure, she has to prepare overnight. But will she be able to satisfy both the personal and the professional demands placed on her? Or will she be forced to sacrifice one case in order to win the other?

In an effort to boost her application, Costello accepts a rape case, against her better judgement. Even worse, Reader is prosecuting her client and delights in riling Costello. As the case draws to a close, Costello begins to realise that things aren't always black and white, especially when she makes a startling discovery.

Costello defends a vulnerable teenager and the pupils are given their first opportunity to stand up in court, taking on a low-level magistrates' case. However, as the cases progress, both Costello and protégé Nick Slade find themselves in challenging positions. Can Costello defend her client without endangering not only her Silk application, but also her career?

Costello is forced to defend a police officer accused of racism at the police tribunal, at the same time as trying to get bail for another client. In the meantime, pressure increases on the pupils as the tenancy deadline draws near. Meanwhile, Reader receives some astonishing news which could change not only his personal life, but life at chambers for everyone.

Costello prosecutes a teacher accused of assaulting a pupil, but believes he is on too serious a charge and is not being properly defended by her colleague Noah Zeigler. Meanwhile, Slade takes on his first major case, and both Costello and Reader have their Silk interviews. Will Costello be able to ensure the teacher a fair trial at the same time as succeeding in her interview?

Costello takes on the biggest case of her life, defending Mark Draper, a repeat offender on a murder charge at the Old Bailey. However, when the case starts to fall apart, she must remain focused on the trial as both personal and private pressures escalate. Meanwhile, it's decision time for the pupils, and the fate of chambers hangs in the balance.