'Unforgotten' Season 4, Episode 1: "The Case of Matthew Walsh"

After three years away, Unforgotten returned to our screens this week. It's been three months since the end of Season 3, and DCI Cassie Stuart (Nicola Walker) walking away from the job. But after 90 days off, she's discovered her application for medical retirement has been rejected. Worse, the three months she took off have been deemed unnecessary. With only a few months left until her 30-year mark allowing for regular retirement, Stuart is going to have to return to the force.

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While Stuart is struggling with the administrative side of things, DI Sunny Khan (Sanjeev Bhaskar) has been powering on, leading the department with DC Fran Lingley (Carolina Main) as his new partner. The latest call is a body found in the middle of moving fridges and freezers around on a dumpsite. At first, it seems to have been in pieces, but it's just missing head and hands. Luckily, there's an MFC tattoo (that's the not-exactly-popular Millwall Football Club) on one arm to help Murray (Jordan Long) track down an identity while Collier (Lewis Reeves) figures out where the freezer came from.