4 ideas
The book traces the cause backward: Margio's father Komar beat his wife Nuraeni for years, she drifted into near-silence and later had an affair with Anwar, and her baby by him died days after birth. Komar then died before Margio could kill him himself. When Margio asked Anwar to marry his mother and Anwar refused, Margio attacked, and afterward he told police it was not him but the tiger inside him.
The novel reveals the killer and the killing on page one, so suspense cannot come from who did it or how. The reader's judgment moves from the individual to the household, the poverty and the years of tolerated abuse that set up the act.
Margio's white tiger comes to him from his grandfather, a spirit that attaches to men of the family. It gives him a language that places an overwhelming violent impulse outside the self. The book never settles whether the tiger is real or a cultural container for rage the young man cannot own. It shows that a supernatural frame can work both as a sincere belief and as a way of explaining how someone could do the unthinkable.
Margio's anger was built up over years against his abusive father. When the father dies of natural causes, that anger does not go away. It moves to the nearest figure who repeats the father's harm to his mother, the man who used her and then refused her. Violence that looks sudden and out of proportion is often long-held rage redirected after the original target is gone.