Several of Monday's papers lead on the hunt for the unknown patient who has tested positive for a Brazilian variant of coronavirus.
The Daily Telegraph says health officials have begun a "scramble" to find the individual who failed to register properly when they took a test.
The i calls it "a mutant strain" that arrived just days before the hotel quarantine system was introduced.
The Guardian says this has led to the government facing "urgent calls" for tougher border measures from Labour.
The Times says Home Secretary Priti Patel is planning to bring in life sentences for people smugglers as a way of cracking down on illegal Channel crossings.
The paper says Ms Patel wants to increase the average three-year sentence that traffickers currently get.
According to the Times, the longer jail terms are part of a series of measures due to take effect next year.
The chancellor's budget on Wednesday continues to take up space on the front pages.
The Daily Express says Rishi Sunak has promised to "keep spending to get Britain moving" and highlights the additional £1.6bn going into the mass Covid vaccination programme.
The Financial Times says official Budget forecasts will show that a rapid vaccine rollout will foster a faster economic recovery requiring "fewer tax rises than feared".
But it believes Mr Sunak's recent comments about the "strains" on public finances have still paved the way for tax increases.
The Daily Mirror has sought the views of the former Labour Prime Minister Gordon Brown for its front page.
Mr Brown is calling for a budget to boost jobs amid the Covid crisis, and warns that failing to act would "condemn a whole generation of young people" to a jobless future.
The Daily Telegraph says a Budget boost for pubs is being considered with Treasury officials holding talks with the hospitality industry.
The paper says the business rates holiday could be extended beyond the lifting of restrictions in June - and all duty on alcohol could be frozen.
"Justice in retreat" is the headline in the Daily Mail.
The paper has carried out an investigation which found that more than half of Britain's police stations have closed in the last 10 years.
It says at least 667 stations with front counters - where the public can talk to officers - have been shut as a result of cost-cutting.
The Mail adds that many more have closed during the pandemic, prompting fears they may never reopen.
A Home Office spokesman tells the paper the government is giving police the resources they need to cut crime and keep people safe.
And several papers carry pictures of the Coronation Street actor Johnny Briggs following his death at the age of 85.
The Daily Express calls him "a legend" for his portrayal of Mike Baldwin.
Metro shows the actor in a characteristic pose with a smile, a cigar and a drink, and the simple headline "Cheers Mike".
And the Daily Mirror sums up his career as "the greatest Corrie rogue of them all".