Mary, Paul, Ken and Andrew share an apartment. One evening they agree to make a false insurance claim. However, Andrew has some misgivings and tells the other three that he is pulling out of the agreement. Ken submits the claim in his name, albeit with strong words of encouragement from Mary and Paul. Ultimately, the claim is rejected due to terms of cover of which they were unaware. Paul and Ken decide to laugh it off and go for a drink. Mary, who is in a relationship with Paul, is feeling nervous and goes for a long walk. In the ensuing weeks she becomes estranged from Paul and is diagnosed with depression and anxiety.
A few months later, Mary catches her husband Paul sleeping with Ken. Mary is outraged and, shaking with extreme anger, runs down three flights of stairs to the kitchen. She picks up a kitchen knife, runs back upstairs to the bedroom and stabs Paul to death. Ken is horrified and, thinking that Mary is going to kill him, grabs the knife from Mary and starts to attack her. However, he only manages to make a few small cuts, scratching her arms and face.
On the way out Ken runs into Andrew and angrily pushes him aside. Andrew hits his head on a nearby road sign. He falls down on the street screaming in agony with blood pouring from a deep wound in his head.
Advise Mary, Ken and Andrew as to their liability, if any, for criminal offences.