Many of the papers focus on splits in Theresa May's Cabinet over what Brexit she should choose.
The Sunday Times highlights the Brexiteers allegedly bidding for power if the prime minister decides to remain in the customs union.
It says Boris Johnson, Michael Gove and Jacob Rees-Mogg are the possible allies to threaten Mrs May's leadership if she faces a coup.
But the paper's headline "all for one, and none for all?" suggests doubt as to whether the three could stick together.
'Music to our ears'
In the Observer, Andrew Rawnsley says Julius Caesar used to be a good guide to the way the party went about getting rid of its leaders.
Now, he says, "the ides of March come round every day" there's "endless discussion about dispatching her without actually going through with the deed."
The Sunday Express urges Mrs May to "spell out" her vision of Brexit saying that would be "music to our ears."
Not "a cuddly, useful trading bloc" but "a nasty, bullying technocracy" is what the Sunday Telegraph calls the EU.
The paper says the member states want to tie Britain down so it does not set its eyes on a global future and pursue a free market model.
Those who engage in political "candidate abuse" could face "a year in jail" if the Sunday People is right.
The Sunday Mirror gives a cautious welcome to the prospect of a law against intimidation in public life, which is set to be proposed by the prime minister later this week.
But it also thinks the freedom to protest must be protected, as well as the freedom to speak. The paper points out that the suffragettes smashed windows, burned down houses, slashed paintings and planted bombs.
The Mail on Sunday sets out to expose the way that "ruthless dealers" are using social media to sell powerful tranquilisers to young people.
The paper says teenagers take Xanax mixed with cough syrup and alcohol - a combination which can cause heart failure, blackouts, memory loss and aggression.
Meanwhile, the Daily Star on Sunday says online adverts have drawn drug-dealers from Liverpool, London and Manchester to California, where cannabis is now legal.
Under the headline "bong-haul flights for UK gangs", the paper says they buy super-strong marijuana and smuggle it back into the UK.
Meanwhile, the Sunday Times carries claims of a number of "ski-doping cheats".
It reveals that a database of blood tests from nearly 2,000 competitors suggests that a third of the medals awarded to skiers since 2001 have been won by people who have given suspicious samples.
The paper says the information it received because of a whistleblower demonstrates "just how ineffective" the anti-doping authorities have been.
The Sunday Mirror has a picture on its front page of some of the 60,000 people who turned out to show their support for the NHS on Saturday. Alongside, it has another photo showing the Health Secretary Jeremy Hunt apparently "napping" at a spa hotel.
The paper tells Mrs May that people would be willing to pay more in income tax to give the service the money it needs and that she should begin building more hospitals.
And influenced by what happens in Scandinavia, The Sunday Telegraph reports that some children's nurseries are wrapping up babies and letting them sleep outdoors in their prams.
The practice was once common here too and an expert tells the paper there is no evidence it can cause harm, provided the babies don't get cold.