Newspaper headlines: May 'to demote Boris' and Major's 'blast'
The overwhelming message on Sunday's front pages is summed up in a Sunday Telegraph headline, which says the Tories are "at war".
Rebel MPs are said to have given Theresa May until Christmas to make real progress on Brexit to avoid another attempt to oust her.
The paper says Mrs May has decided to commit billions of pounds on preparing Britain to leave the EU without a deal - to send a signal to pro-Brexit MPs that she's serious about regaining the upper hand in negotiations.
According to the Sunday Times, the prime minister will reassert her authority with a cabinet reshuffle in which she is prepared to demote Foreign Secretary Boris Johnson.
Tory sources have told the paper she will shake up her top team later this month.
In an interview with the paper, Mrs May says: "It's never been my style to hide from a challenge and I'm not going to start now."
In his article in the Mail on Sunday, Sir John Major tells the plotters it is time to focus on the needs of the British people rather than their own ambitions if they want to avoid two 'neo-Marxists' being in government - a reference to Jeremy Corbyn and John McDonnell.
In an editorial, the Mail urges Mrs May to seize the moment and attack.
"While willing to wound," it says, "her foes fear to strike".
It advises her to "get rid of unreliable and worn-out ministers".
According to the Sunday Express, "Brexit's big three" - Boris Johnson, Liam Fox and David Davis - "have thrown their weight behind Theresa May" and urged Tories to rally round her as leader.
In an article for the paper, Dr Fox praises the prime minister's "great inner strength".
But Nigel Nelson in the People says Mrs May is no longer "she who must be obeyed" and instead labels her: "She who's being abandoned."
The Sunday Mirror has a front page picture which it says shows prisoners cooking steaks smuggled into their jail.
Pictures inside the paper are said to expose the lifestyle of convicts - with no fear of authority - partying on drugs, vodka and take-away pizzas and fried chicken.
The paper says the pictures "shame our failing prison system".
A spokesman for the Prison Service is quoted saying: "This behaviour is completely unacceptable."
The Sun on Sunday also features a prison story.
It says "prison chiefs have been blasted" after reports that a mother was groomed from behind bars by the jailed paedophile, Lostprophets singer Ian Watkins.
It says it led to the woman's two-year-old daughter being taken into care, after police and social services were alerted.
The paper says it's only the latest in a series of scandals and the prison bosses who allowed it should be ashamed of themselves.
Many of the Spanish papers carry pictures of the demonstrations for national unity that took place on Saturday, calling on Catalans to reject independence.
The country's biggest selling newspaper, El Pais, criticises the authorities in Catalonia, saying they should never have encouraged a large part of their population to go outside the legal framework and vote in a referendum already banned by the constitutional court.
The Observer says huge numbers are expected at a demonstration by Catalans opposed to independence in Barcelona today.
According to the Sunday Times, "Spain is a powder keg" as Catalans edge closer to breaking away.