Immaculate Conception

The year is 2116. Millions of American and European refugees run from the destruction of the war-torn Northern hemisphere and flood into Megasampa, the urban sprawl formed when the metropolitan areas of Sao Paulo and Rio de Janeiro joined in the mid-21st century.
They gather in the Novo Bronx ghetto, a place of vice, death and hardship, but also of refugees just trying to rebuild their lives. Novo Bronx was never a quiet place by a long shot, but now unrest grows as a series of macabre murders strike fear into the heart of the populace. Murders attributed to a creature the locals are calling Bebê Diabo, the Devil Baby.
The Proctech private police quells the rebellion for the time being, but the gruesome deaths are unlike anything they have ever encountered. Reluctantly, they call out of retirement the only detective insane enough to solve an insane case.

A detective called Cascavel.

Immaculate Conception is the first book in the Cybersampa series.