Whodunnit!? We've waited eight weeks for this and, tonight, we should - finally - find out who the murderer is! Who killed the young boy Danny Latimer.
Much of it was filmed in West Bay, on the Dorset coast. And, fans of the series - starring David Tennant - have been travelling there from across the country. Tourism officials say there's been a record number of visitors.
We spoke to Chris Chibnall, who wrote the series.
More top news
Tuesday night's weather for the west of the region
Tuesday night's weather for the east of the region
Simon's Blog - Up In The Air