BBC VIEWERS have been left fearful a beloved thriller has been axed for good after four series. Eagle-eyed fans of the station's drama Vienna Blood have spotted a 'clue' which might seal its fate. 3 BBC viewers have been left fearful a beloved thriller has been axed for good after four series Credit: Getty 3 Eagle-eyed fans of the station's drama Vienna Blood have spotted a 'clue' which might seal its fate Credit: BBC/Endor Productions/MR Film/Pe 3 The show follows Max Liebermann, and Detective Inspector Oskar Rheinhardt Credit: BBC Vienna Blood is set in 1900s Vienna and focuses on a brilliant young English doctor, Max Liebermann, and Detective Inspector Oskar Rheinhardt, who investigate a series of unusual and disturbing murders.

The show is an adaptation of Frank Tallis's Liebermann best-selling book series. The show returned for its fourth series earlier this month on the Beeb - albeit for just two episodes. It was based on author Frank's seventh and last book, leaving fans concerned the show won't return for series five.

more on vienna blood BLOOD THIRSTY This is what happened in Vienna Blood season 1 and 2 FACT OR FICTION? Vienna Blood explained: Is the BBC Two series based on a true story? Taking to social media, one viewer said: "If this is the last season, I will miss this show so much - but a cracking conclusion. What a fabulous team and excellent storytelling." A second wrote: "This had better not be the last ever episode or I’ll really kick off.

" "Another brilli.