Yep, dog-murdering. Because that's what they did, you see, towards the end of this third episode. They killed a dog.

Who killed the dog in Marcella?

The closing moments of the show saw detective Marcella Backland's son Edward kill his pet mouse with his bare hands. One angry viewer wrote: “@ITV is it really necessary to end Marcella with a child squeezing the innards out of a mouse! Irrelevant and unnecessary whatever the forward storyline is #Marcella.”

Who murdered Grace Gibson?

Marcella returns for a brand new series. Tonight 9pm. But then the son of a construction company owner, Henry Gibson, who happens to be the brother of Grace is revealed as the serial killer. He then takes his friend Matthew Neil hostage and attempts to frame him for his crimes.