The first time Liying* realised she was being watched, she was on her way home from an anti-Beijing protest outside the Chinese embassy in London in 2022. The sky was dark, and Liying – a student in her 20s from China – was walking with a fellow protester, megaphone in hand, when she noticed a stranger lurking behind them.
The pair quickened their pace but the man, who looked Chinese, kept following. Ten minutes passed; then 20. Eventually, they ran into a nearby hospital and hid for more than half an hour. When they came out, he was gone.
