Layla's fingers danced across the keyboard, a manicured nail tapping rhythmically on the 'Enter' key as she refreshed Camila Martinez's Instagram feed for what must have been the hundredth time that day. The glow from her laptop screen illuminated Layla's face, casting shadows that deepened the look of cunning in her sharp blue eyes.

　　"Look at you, Camila," Layla murmured to herself. "All smiles and subtweets. What's your game?"

　　The constant vigil over Camila's ...