The Sky crime drama 'Under Salt Marsh' has concluded its six-episode run, culminating in a finale that unravels the mystery behind the murder of Cefin Hill. Set against the backdrop of Welsh landscapes, this thriller, starring Kelly Reilly and Rafe Spall, has captivated viewers with its intense plot and character development. The gripping conclusion reveals that Cefin was killed by Mac Jones, a character linked to the environmental hazards portrayed in the series.

The narrative takes a darker turn in the final episode, where the circumstances surrounding Cefin's death are explored. Initially perceived as just a murder mystery, the storyline intertwines social issues, particularly concerning environmental safety. Cefin's death is revealed to be connected to toxic waste dumping at Morfa Halen, highlighting the severe implications such actions can have on local communities and individuals. The narrative serves not only to entertain but also to raise awareness about environmental crimes and their consequences.

As the finale ties up loose ends, it leaves viewers reflecting on the broader themes of justice and accountability in the face of environmental negligence. 'Under Salt Marsh' has managed to deliver drama and suspense while also prompting discussions on urgent social issues, making it a noteworthy addition to Welsh television productions.