The many strands of the poisoning of former Russian spy Alexander Litvinenko dominate the front and inside pages of Sunday's newspapers.
The Sunday Times claims President Putin has "expressed his anger" at Britain's failure to gag him.
More than 30 Russian spies are operating in the UK, claims the Sunday Telegraph, which likens the complicated story to the novels of John Le Carre.
The Independent on Sunday also notes the "exotic cast of characters".
Former head teacher and government consultant Des Smith is the first person to be held in connection with the loans for peerages affair.
Mr Smith tells the Mail on Sunday he was taken from his bed in a police raid and spent a day in the cells surrounded by violent criminals.
Meanwhile, the News of the World claims the MI5 thinks terrorists are planning a big attack on Britain's energy plants.
The Times says MPs are pressing for a 60% pay rise to £100,000.
As David Cameron prepares to mark his first anniversary as Conservative leader, the papers assess his progress.
"Not bad for Year One", is the verdict from one group of floating voters brought together by the pollster, Frank Luntz, according to the Telegraph.
But the Sunday Express rather bluntly tells its readers Mr Cameron must "drop his 'hug a hoodie' philosophy and start talking like a proper Tory".
The Independent headline reads: "Cameron's first year - not bad, Dave".
In a bid to tackle growing numbers of people who are obese, the Independent reports the National Health Service will provide dance classes.
GPS will prescribe "sedentary" people with activities like street dancing.
Meanwhile, not even a funeral is safe from the compensation culture sweeping Britain, according to the Mail.
The paper claims pallbearers are being asked by funeral directors to sign waiver forms in case they hurt their backs carrying the coffin into church.