When Vladimir Kara-Murza announced he was returning to Moscow earlier this year, his wife Evgenia knew the risk but did not try to stop him.
Russia had invaded Ukraine and made it a crime to call it a war. Thousands of protesters had been arrested. Vladimir himself was a sworn opponent of President Vladimir Putin and an outspoken critic of atrocities committed by his military.
Still, the opposition activist insisted on being in Russia.
Now he has been locked up and charged with treason and Evgenia has not been allowed to speak to him since April.
But in a series of letters to me from Detention Centre No. 5, Vladimir – who has twice been the victim of a mysterious poisoning – says he has no regrets, because the “price of silence is unacceptable”.