Popular singer Debolina Mukherjee is found dead in her bungalow, due to an overdose of sedatives. In the same room is a stranger’s body, shot in the head. As ACP Agni Mitra starts investigating, he meets the key players - an ageing hitman, a crafty real estate tycoon, a ruthless high-society woman and a reclusive police official who was thrown out of the force. Who was the dead man in Debolina’s room? Did the two victims fall prey to ghosts from their past lives? Are these deaths related to a decade-old shootout mystery which Agni must solve? The Trail of Blood is a nerve-wracking journey into the uncharted depths of the human mind where greed, obsession and insecurities unleash the demons inside.