Law & Order: UK S08E02 - Safe from Harm

The stabbing of a psychiatrist who treated teenagers and children initially leads Ronnie and Joe to question his violent adolescent clients. However, when they uncover evidence that points to him having an affair with one of his patients, they begin to suspect that his wife, Alison, might have had more motive than anyone else. Although she initially denies killing her husband, Alison quickly changes her defence when the evidence stacks up against her. Her argument that she wasn't in her right mind and lost control when she stabbed him, challenges the prosecution, and Kate questions whether they should be trying her for murder at all.