John Swinfield 
Knock Down Ginger [EPUB ebook] 

A serial killer tortures and slays his prey. In his bloody wake comes hard-eyed detective Jack Raven, and his young protege, Rosie Diamond. As the mystery unfolds, the action switches from the wealthy and powerful in the monied enclaves of London, to the drug-riddled, impoverished slums of South America, and the endangered settlements of the Brazilian rainforest. As Raven and Diamond pursue their quarry, an evil network is revealed, leading to an anguished moral dilemma.