The Yuhuatai Memorial Park of Revolutionary Martyrs is hallowed ground for the Chinese Communist Party. Here stand a soaring monument and super-life-size reliefs to honor the memory of party members, most then operating as secret agents, executed by the Nationalist government in the 1930s and ’40s.
Today, hordes of mostly elderly tourists pose with the Communists’ hammer-and-sickle flag.
Yet the most recent addition to the site has garnered less interest than the memorial, or the souvenir stalls nearby — but serves as a tangible testament to China’s perennial preoccupation: espionage.
Billed as the country's only such...