The Ghost Squad

The routine arrest of a young man turns into a murder case when Amy finds him alone in the interrogation room beaten and drowned in his own blood.

Amy, the Ghost Squad's newest recruit, investigates a team of undercover cops who've been tracking a network of sex traffickers.

Sgt Ralph Allen is an old-fashioned, no-nonsense copper; McKay suspects he is bringing the force into disrepute and needs to be removed.

Sally Marshall is the head of a serious-crime squad, but her clear-up rate is suspiciously high and officials suspect she might be cutting corners to get results.

Amy has three targets within the witness protection unit; one of them is desperate to prevent a murder witness from providing key testimony.

Sarah Houghton's profile suggests she's a good, dedicated cop, but the financial crimes unit reports irregularities in her bank account.