Geoff Hardcastle is visiting a laboratory talking to Doctor Henry Fane, who is surprised Doomwatch are taking the allegations seriously. There is an organised vendetta against his work, and him personally. There is a woman in the village called Miss Lincoln, a crank, thinks Fane. He blames her for the slashed tyres, broken windows, and water being put into the fuel for the boilers. She has turned everybody against them, it drives away his assistants. The problem is she is a dog lover. She found out that they had a license to experiment with animals and that was it. 'God knows what she is going to do next.' The shot that rings out, smashing a window seems to be his answer. Furious, Fane goes to phone the police– but then sees Geoff Hardcastle lying on the floor, clutching his arm, very still... (thetvdb.com)