Gui Minhai, a naturalized Swedish citizen, was the first to go missing, vanishing from his vacation home in Pattaya, Thailand, in October. In the same month, three of his associates, Lui Bo, Cheung Ji-ping and Lam Wing-kee, also disappeared after separately visiting Shenzhen, a Chinese city just across the Hong Kong border. Lee Po, a British citizen, was the fifth bookseller to g