Book excerpt: How can one of the world's most free-wheeling cities transition from a vibrant global center of culture and finance into a subject of authoritarian control?As Beijing's anxious interference has grown, the "one country, two systems" model China promised Hong Kong has slowly drained away in the yearssince the 1997 handover. As "one country" seemed set to gobble up "two systems," the people of Hong Kong riveted the world's attention in 2019 by defiantly demanding the autonomy, rule of law and basic freedoms they were promised. In 2020, the new National Security Law imposed by Beijing aimed to snuff out such resistance. Will the Hong Kong so deeply held in the people's identity and the world's imagination be lost? Professor Michael Davis, who has taught human rights and constitutional law in this city for over three decades, and has been one of its closest observers, takes us on this constitutional journey.