Chris Lang's Unforgotten returned for series five on Monday, February 27, and viewers have been gripped ever since. While some have been watching the episodes weekly as they drop on ITV1, others have binged the six-part series after it was made available to watch on ITV's streaming platform ITVX.
The new season saw the return of Sanjeev Bhaskar's character DI Sunny Khan, only this time he was joined by DCI Jessica James, played by Sinéad Keenan, following the exit of Nicola Walker. The actress played DCI Cassie Stewart for six years from season one to four but left after her character died in a huge twist at the end of the last series. You can read more on what happened to Cassie here.
The new drama and character have proven to be a big hit among viewers, but some eagle-eyed fans have been left scratching their heads over one element, and even took to social media to ask writer Chris a burning question.
