The thriller is about the worldwide search by a young doctor for the most evil sociopath that has ever lived. He is a 12-year-old boy, and the doctor's decision to save his life has unwittingly unleashed a Pandora's Box that leaves the doc battling to stop a plot of mass genocide.
I don't know how a 12-year-old child has the wherewithal to plan mass genocide, let alone stay out of sight long enough to plan such a deed, but that kid has to be one mean sonuavbitch. In the manga, the 'monster' returns nine years later and is a grown man carrying out his evil plan. I guess a child is scarier.
Del Toro will work with Dr. Who and Sherlock scribe Steven Thompson to develop the pilot; Thompson will write and del Toro will direct. If the series is a go, they will take on producer roles for the series.