After the cutscene, go to the place on the GPS. Go round the back of the alleyway to avoid the police. In the minigame, apply explosives to the back of the Enforcer to release the prisoners and get a wanted level. Drive them to the next blip on your map to pick up Hsin's accountant. Finally, drive them to the Higgins Helitours landing platform in Castle Gardens so they can escape in a helicopter.
Mission Replay description
"Feds are crawling all over Triad operations. We've got a rat!
Chan got arrested, but Hsin was more concerned about his dirty money getting out of the country.
He got me to get it out of the city before the Feds discovered it."