The team are closing in on a convicted sex offender, but are missing a crucial piece of evidence; and newcomer DC Mark Rosen is set on the trail of a paedophile who may be carrying out his former cellmate's work.
| Name | Type | Role | |
|---|---|---|---|
| Declan Croghan | Writer | ||
| Tom Bennett | Guest Star | ||
| Tony Mooney | Guest Star | ||
| William Armstrong | Guest Star | ||
| Rick Warden | Guest Star | ||
| Peter Wight | Guest Star | ||
| Liam Mills | Guest Star | ||
| Tilly Vosburgh | Guest Star | ||
| Karl Nelson | Guest Star | ||
| Levi Hayes | Guest Star | ||
| Alastair Galbraith | Guest Star | ||
| Kerry Elkins | Guest Star | ||
| Badria Timimi | Guest Star | ||
| Alison Skilbeck | Guest Star | ||
| Joe Hall | Guest Star | ||
| Bo Poraj | Guest Star | ||
| Christine Bottomley | Guest Star | ||
| Andrew Frame | Guest Star | ||
| Justin Chadwick | Director |