3rd mission of Treasure Hunt mision pack.

Lucas is a taxi driver and work in Los Santos. Being a taxi driver is not enough for him to live in clover. One day, when he was waiting for a passenger, he heard a woman screaming for a help. In the same time, a guy was running in front of him and he thinks that the guy robbed the woman. In no time, he pursuing the guy. There were two other guys that was chasing the robber, August Green and Snow Bullock. After the incident, they become friends. One night, August tell them about a secret treasure. He invited them to be a part of him, become a treasure hunt. Without hesitation, Lucas and Snow
accepted his quest.
Then, in the tomorrow, the journey begin.

Official page:
http://www.gtaforums.com/index.php?showtopic=496783