Newspaper headlines: Russia 'assassination plot' and Brexit 'limbo'
The Daily Telegraph carries claims from senior Whitehall sources that Russia plotted to assassinate the prime minister of Montenegro and overthrow its government last year.
It is claimed the plot was designed to sabotage Montenegro's attempts to join Nato and was foiled "only hours" before being carried out.
The paper says British and American intelligence agencies have gathered evidence of "high-level Russian complicity" - but the Kremlin has denied any involvement.
A leaked document seen by the Observer suggests the EU is concerned that millions of EU nationals from other countries living in the UK will be "stranded in a legal no-man's land" after Brexit because of weaknesses in Britain's immigration system.
The report - drawn up by MEPs - argues the Home Office doesn't have the information or systems in place to select who can stay once Britain leaves.
The lead story in the Mail on Sunday claims the head of the police force investigating allegations of historical sexual abuse against Sir Edward Heath is convinced the former prime minister was a paedophile.
Wiltshire's Chief Constable Mike Veale is said to regard the claims as "120% genuine" and plans to publish a report in June.
Sir Edward died in 2005, and the Sir Edward Heath Charitable Foundation has previously said it is confident he will be cleared of any wrongdoing.
Wiltshire Police declined to comment on the story but said its chief constable had previously stated it was his job to ensure the probe was "proportionate, measured, legal and necessary".
A head teacher in Oldham has raised fears of a new "Trojan Horse plot" to take over her school, according to the Sunday Times.
She is said to have emailed her local authority in December to report a campaign of intimidation against school staff, and to highlight concerns about the activities of a Muslim former parent governor.
The lead story in the Sunday Express says children as young as five are calling a helpline to be read bedtime stories because their parents are too drunk to tuck them in at night.
The paper's editorial argues it's a "national scandal" that so little has been done to help the estimated two-and-a-half million children who live with an alcoholic parent.
It says it is "even more tragic" that no local authority appears to have a strategy to deal with the problem.
The Sunday Mirror claims a convicted rapist who is alleged to have won a lottery jackpot of £2.5m with a fraudulent ticket carried out a "dry run" of the suspected scam.
He is said to have shown friends a faked ticket in 2009 - five months before he claimed the prize money.
The Mirror says he has refused to comment on the fraud allegations that have been made against him, and police investigated the case but decided to take no action.
The Mirror's editorial argues the Gambling Commission probe into the payout was covered up, and calls for this latest evidence to be investigated as part of an inquiry by MPs because, it says, "a parliamentary report cannot be covered up".
Meanwhile, Justice Minister Liz Truss has told the Sun on Sunday that prisons must stop acting as offender warehouses and rehabilitate inmates instead.
She says she is determined to get a grip of the "epidemic of reoffending" so will change the law this week to make reforming offenders a "key aim" of prison.
According to the paper, seven months in the job "have convinced Ms Truss of the enormity of the task", after violence in prisons hit a 10-year high under her watch.
And Lincoln City's win in the FA Cup yesterday - making them the first non-league side to reach the quarter final stage of the competition for over a century - allows the headline writers to come up with a plethora of puns, using the club's nickname, The Imps.
The Sunday Telegraph says Lincoln's feat will have repercussions "long beyond this season" as the club's financial future is now secure "for many years to come".