Doctor ID. The Dream Web Files Trilogy, #1

At the dawn of the internet era, a maniacal spectre weaves his sinister web across the digital landscape. Detective Dave Draper's team fruitlessly pursue the serial killer dubbed 'The Invisible Man', a faceless fiend who leaves no forensic clues. But the stakes are raised to a personal pitch when Draper's daughter, Jade, a tech-savvy prodigy, embarks on her own covert mission to unravel the murderer's cryptic cyber trail.
With her friends Wing, Bruce, and Lucy by her side, Jade determines to outsmart the elusive predator at his own game. Yet, as the boundaries between reality and nightmare blur, the hunters soon find themselves the hunted in a deadly dance with the online entity known as Doctor Id.