Unforgotten

Sunny is called to a dump sight in Haringey, where a headless body has been found amongst the freezers. Meanwhile, Cassie has been on medical leave and doesn't want to go back for her final days.

As Sunny and Cassie investigate they find that a graduating class of police officers could all be connecting to the case- some are still serving in the force.

Cassie and Sunny interview the four suspects, who all deny knowing the victim. Boulting discovers Walsh was cautioned three weeks before his death and believes it was with Ram.

Cassie and Sunny discover Walsh was chased by all four suspects on the night in question. Willets realizes Fiona's blood sample may have been deliberately lost by Liz.

Cassie and Sunny interview two of the suspects again and get closer to the truth of what happened to Walsh. Balcombe believes she may have found the cause of death.

Despite a tragic turn of events, Sunny and the team narrow down the suspects.