<P> In the final episode, the looming merger of city and county police and misgivings about corruption, lead Thursday to consider retirement, in response to strong hints from C.S. Bright about age and health . Disheartened by this, Morse speculates to Monica about leaving the police and going abroad with her . Assistant Chief Constable Clive Deare asks Thursday and Morse to covertly investigate corruption within the police and council . Morse is sent to a rendezvous where he is ambushed by corrupt officers and Thursday is lured to Blenheim Vale, a derelict former wayward boys home, where there was rampant sexual and physical abuse (of which Jakes was a victim). Morse escapes the ambush and goes to support Thursday, who is shot by Deare, a participant in the abuse at Blenheim Vale . Deare tells Morse he has framed him for the murder of Chief Constable Rupert Standish . Deare is about to kill Morse when he is shot dead by a girl who had also been abused at Blenheim Vale, who then kills herself . Bright and Strange show up with backup and an ambulance . As Thursday is being loaded into an ambulance, Morse is arrested by officers from another force for the murder of Chief Constable Standish . The series ends with Thursday's fate unknown and Morse in a jail cell . </P> <P> Series 3 begins in Spring 1967 . D.C. Morse has been cleared of the murder of Chief Constable Standish and the records in the case of Blenheim Vale are sealed for 50 years . D.I. Thursday has been discharged from hospital, but the bullet could not be taken out of him and has resulted in recurring coughs . Monica has come to realize that she and Morse have gone their separate ways . Strange has been promoted to Sergeant and Morse considers his future after his time in prison, but with Thursday's encouragement, Morse returns to active duty investigating a murder following a disappearance at a funfair on Cowley Green . After solving a faked kidnapping and tainted fruit being sold at a local supermarket, D.S. Jakes retires from the Force and leaves Oxford . Strange takes Jakes' place as Detective Sergeant but assures Morse that they're still friends even though he's now his superior . Detective Inspector Thursday shows frequent signs of outbursts against suspects unwilling to co-operate during the investigations, and even uses violence as a way of extracting information . Although Morse is unsure about becoming Sergeant, Thursday assures him he's more of an Inspector . </P> <P> In the final episode, Morse finally sits his Sergeant's exam and completes his paper well within the time allowed . An armed robbery takes place at a bank where Joan Thursday works and the armed robbers become trapped themselves along with Morse during an investigation into a killing and payroll robbery . After the robbers are arrested, Joan, emotionally affected by the ordeal, leaves Oxford for new pastures despite encouragement to stay from Morse . Realizing that Joan has gone, Thursday encounters Morse outside his house, and figures that he saw Joan leave . Thursday returns to his house and Morse follows him . </P> <P> Starts in the summer 1967 and ends in the autumn of the same year . Joan Thursday is still away and Morse finds out his Sergeant's exam went "missing" which meant automatic failure . </P>

What happened at the end of endeavor season 3
find me the text answering this question