Sister may only be one episode old, but viewers are already out.

The new ITV murder mystery begins Monday night and airs for four consecutive nights.

It follows Nathan Redman, played by Russell Tovey, and surprises Bob Marrow with a face he has never liked before.

In the first episode, the extraordinary expert Bob appears at the house of the Lord he shares with his wife Holly.

His old acquaintance warned her that they would have to move her body as a housing development was planned to dig up the woods where she had been buried before the old flashbacks.

While the story context captivated the audience, they were really shocked by the transformation of the actor playing Bobby.

Bertie Carwell plays a strange character.

In 2015, he played the role of Jonathan Strange in the film Jonathan Strange & Mr. Norrell and Simon Foster in the BBC drama Doctor Foster.

Viewers were tweeting about it.

“It simply came to our notice then. I understand that it is Simon from Foster, ”one wrote.

Another said: “I saw that Dr. Foster’s husband was in #sister, and they realized he was Bob’s player.”

“Bob now recognizes # Sister as the husband from Dr. Foster, and he’s very different,” said one-third.