The Nightclub - GTA Online: The Contract
Exit the Agency to investigate The NIghtclub.
After talking to Franklin, Go to the nightclub.
After reaching, Enter the goods enterance.
Locate the security tape, after getting inside.
Kill every guard without being detected.
Enter through this red door to go deeper inside.
After killing everyone, steal the security tape inside security room.
After that leave the nightclub.
After killing some more guards, you can get out of the nightclub.
After sucessfully escaping the pursuit, Deliver the security tape to the Agency.