- Criminal Investigation Department officer CHIU CHIN-LUNG (Bosco Wong) follows some kidnappers to a hotel while on duty. As soon as he enters the hotel, the medical authorities announce the closure of the hotel after a guest is found positive for having the H1N1 virus. While he was in the hotel, he meets all sorts of people including YIK CHO-ON (Steven Ma) who pretends to be a Thai-Chinese jeweller and his partner WONG KAR-YUE (Sonija Kwok). Although LUNG knows that ON has nothing to do with the kidnapping, he believes something sinister is going on with LUNG and YUE. He join hands with blundering reporter TONG CHING (Joyce Cheng) and AUYEUNG KA-KA (Lo Man Chong) to probe into the case. As they go deeper, they are not only astonished by the guests’ stories but also their identities. The 7-day closure will be coming to an end. Will LUNG be able to find the hostage in time? Will the guests have a different outlook at life when they return to their normal lives?