Je vais te détruire (Belfond noir)

The story kept me on edge throughout, but I'm curious whether the mood was crafted from the start or evolved during writing. How did the author decide on this tone?

The moral ambiguity made the character so complex, but I found myself unsure whether I wanted justice or revenge to win. Was that intentional?

The pacing of surprises kept me guessing, and I wonder if the plot was mapped out meticulously or if it developed organically during writing.