During the first level, swing to the left slightly when you start. You should go over a building with a helipad. Then, go down to the next building that has a billboard. There will be two Skulls on the rooftop and a purse. After you defeat the two Skulls your character will notice the purse. Next, turn towards the billboard and go back over the roof with the helipad and start to go right to the next rooftop. There will be two Skulls and a woman. Beat up the Skulls and talk with the woman. She will say she lost her purse. Go back to the building with the purse and bring it back to her. This will give you points for the secret in this level.