Sorry for disappearing greyduster.
The estate was going to become a safari park but it never happened except that they got some animals but then got rid of them, except the tiger, which then mauled the sister.
When she found out it was still alive she wanted to teach the brother a lesson and arranged for him to get mauled by the tiger by planting female tiger musk on him but it killed him and escaped. She stole the musk from the man whose au pair went missing, confusing that.
It killed the bird watcher whose arm was found in the river.
The chief inspector told a story about how years ago he shot a tiger in India but not before it had killed a policeman.
At the estate the sister in law with the baby went for a walk in the maze, the baby in a pram, the police arrived with guns, Morse saw the tail of the tiger disappear into the maze. After lots of scary stalking Morse ends up protecting the woman and baby by getting between her and the tiger. He tells her to run when it attacks, it does, she runs, a shot is heard, the tiger is dead, Morse is saved and who fired the shot? I think you can guess, the chief inspector.
It ended not so well by the bed of the girl who had been attacked years ago by the man who killed the au pair, Thursday and Morse talking about Morse taking his exams, poor taste.
Phew, left out some details but, probably forgotten loads but have put in enough hopefully.