Grand Theft Auto III/Ransom

Brief
This isn't much of a mission—just a cutscene. When you return to the construction site with Catalina's SPANK, you find that your ex-girlfriend has taken Maria as hostage, and has left Miguel and Asuka dead, along with a ransom note:
 * "I've got your precious Maria. If you don't want her face to look like she fell out with the butcher, bring $500,000 to the Villa at Cedar Grove."

When you're ready, head to her mansion in Shoreside Vale.