Dethklok frontman Nathan Explosion wants the band's next album to be the ultimate smash hit. So, to achieve this goal, he decides to have a recording session locked in a Russian nuclear submarine that is moving through the Mariana Trench - the deepest, darkest location in the Earth's crust itself. How brutal is that?!

A teenage girl is found tortured to death at a London dogs' home, and it soon emerges another young woman is being held by the culprits, who turn out to be a violent team of animal activists seeking to destroy an experimentation facility. However, the case becomes much more complicated when Nikki is kidnapped at gunpoint by the group leader.