The Line Watchers is a story about Hong Kong’s customs officers. Intellectual Property Investigation Bureau Senior Superintendent Benjamin Yuen, Trade Controls Officer Mandy Wong, and Customs Drug Investigation Bureau Superintendent Venus Wong leads a group of elite customs officers and rookies. From eggs to atomic bombs, powdered milk to drugs, they are on standby on land, air and ocean as the face of the new “Smart Customs” program. This group, amidst personal adversities, is able to overcome difficulties and uphold the motto of “Commitment and Excellence,” contributing to the stability and prosperity of society and becoming gatekeepers that Hong Kongers can be proud of.