Head to the marker and interact with it to start the mission. Go to the backyard to join the party. Watch the following scene. After that, head inside the house. Wait until Nicky receives a phone call. Hack her phone to eavesdrop. Once done, Aiden will track the caller. Find a vehicle and pursue the caller.
Keep bumping his car and force him to total his vehicle. Once done, the suspect will flee on foot. Continue pursuing him and take him down. Hack his phone and wait for the conversation to finish. Mission complete.