The book starts with the dead body of a submarine engineer being discovered on the railway tracks in Vizag. He was an employee of Hindustan Shipyard Limited which is building India’s nuclear submarine fleet. This is the fourth submarine engineer in the last twelve months who perished under mysterious circumstances. Navy leadership gets suspicious about a covert sabotage operation being carried out by an unknown enemy, to slow down India's attempt at acquiring a potent nuclear deterrent platform. After deliberations at different levels, an Intelligence Bureau agent is sent to Vizag to work as an undercover operative. Follow Twisha's thrilling adventures in the city of Vizag to uncover a sinister conspiracy.