This mission is given to you by Gerry Mcrearie after finishing all missions for Packie, Derrick, and Francis.
In this mission Gerry wants you to kidnap a mob boss's daughter so she can be held for mad ransom money. Your part in this (the mission) is to head to an Internet-Cafe and respond to her car for sale ad on the Auto website. After you arrange a meeting to see and drive the car you will pick her up and take the car for a test drive.
Some point during the test drive she will ask why it's taking so long to which Niko will come clean and tell her she is being kidnapped. The daughter now goes bitch mode and will start grabbing the wheel of the car which can cause you to crash and in some cases flip over the car, ending the mission. I took it kind of slow and steady when she started doing this so I wouldn't crash. I would just hit the brakes once she grabbed the wheel and would make progress driving once Niko had her back under control.
After Niko does a certain little thing she will stop bothering you and the drive to the hideout will be peaceful. Once you arrive and deliver the girl you will be payed $9500 as well as your achievement.