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.