Jake is humiliated when he makes a spectacular rookie error on Brighton Pier. Meanwhile, an eccentric drug dealer is finally in Jo's sights, but his esoteric musings prompt her to consider her life choices.

With an escaped prisoner on the loose, Carl and Felix investigate a spate of muggings on public school boys. Meanwhile, Jo investigates a distressing case that brings Jake and Ryan to blows.

The team struggles to cope with a nightmarish Saturday night in Brighton, including a drugs death, a stake-out, and a dog high on cocaine.

Felix investigates a kidnap case with more to it than meets the eye. Jo struggles with Robert's rejection and Carl is left to pick up the pieces.

Following revelations about his son, Ryan loses his temper, and Jake witnesses a darker side of his mentor. Carl's chaotic personal life threatens a high-stakes case, and a runaway iguana plays cupid for Lino.

When she's held at gunpoint, Donna's quick thinking saves the day but has personal ramifications. And as Felix and Carl investigate the disappearance of a teenager, Carl gets a disturbing insight into his boss' life.

An ex-squaddie suffering from PTSD loses his grip on reality and endangers the team.