The Trident missile row is the lead for the Times, the Guardian and the Mirror.
According to the Times, the Obama administration asked Britain to keep details of the botched test secret.
It quotes a British military source as saying the British submarine successfully carried and launched the missile, but the bit that went wrong was the US proprietary technology.
Prime Minister Theresa May and the Defence Secretary, Sir Michael Fallon, come in for heavy criticism in some quarters for their refusal to answer questions about the alleged failure of the Trident missile test.
The Mirror accuses them of treating the public like children – and urges them to be open and straight with the British people.
The Guardian says the test raises critical questions about the safety and effectiveness of Britain’s nuclear weapons system – and should not be concealed from MPs.
For the Times, the merits of Trident should be shouted from the rooftops – but that is no reason to hide failings.
They should be examined seriously and openly, with a view to putting them right, it adds.
The papers look ahead to Tuesday morning’s Supreme Court ruling on whether the prime minister will have to give MPs a vote before triggering Article 50.
The Times says most experts think it is unlikely the judges will overrule the decision of the lower High Court – and the government is preparing for defeat.
According to the Guardian, government lawyers have warned Theresa May that drawing up a very short piece of legislation in response to the ruling may not be adequate.
It says the legal advice is that failure to provide enough detail could open the government to further legal appeals in the future.
The Express says the Supreme Court is expected to agree with the High Court judgement that a vote in Parliament on triggering Article 50 will be necessary.
If that is so – the Sun says – then campaigners will have made their point, parliamentary sovereignty will have been upheld and the government must immediately bring forward a Brexit Bill.
Parliament must then do its duty and enact the will of the biggest mandate in our history, the paper adds.
It warns that MPs and peers will be “playing with fire” if they draft amendments pushing for what it calls some phoney compromise.
The Mail, too, urges Parliament not to “sabotage” a Brexit Bill with any wrecking amendments.
It says any MP or peer who backed them would be treating the electorate with contempt, and the referendum result with disdain – and defying the will of the people.
Royal Baftas ‘stand-off’
The Mail reports that ambulance trusts across England are so desperate to recruit paramedics that they are offering generous packages to fill gaping vacancy lists, including sign-on bonuses of up to £10,000 and relocation expenses.
Figures obtained by the paper show that regional ambulance services are short of 745 paramedics.
It says morale is so low that more paramedics are leaving than the number signing up.
The government has increased training places, but that is unlikely to have an effect for many years, the paper adds.
The Sun leads with a report that the Baftas are involved in an awkward behind-the-scenes stand-off with their president, Prince William, over whether he will attend the awards with his wife.
It says the prince had intended to go to the ceremony next month, after missing it for the last two years.
Two separate Bafta sources have told the paper that senior staff at the organisation fear that the Duchess of Cambridge could steal the spotlight from A-list actresses if she comes too – and have suggested it would be preferable for him to turn up alone.
An official Bafta statement published by the paper says the organisation would be delighted to welcome both of them any year they are able to attend.
Finally, a British company has developed a smartphone app that helps commuters overcome an awkward social situation: you want to offer your seat on a crowded bus or train to a woman you think is pregnant – but are not sure and do not want to give offence.
The Times reports that it alerts passengers within 15ft if a pregnant woman would like a seat – effectively a “smart” version of a “baby on board” badge.
The app comes in two parts: mothers-to-be download a “request seat” app to send the alerts, while anyone else can download the second app to receive the alerts.
According to the paper, once a passenger has received a notification – causing their phone to ping or vibrate – both parties must rely on eye contact to spot each other and the seat can then be offered.