Four friends. Hidden tunnels. Deep secrets revealed.

‘Slowly, gingerly, they crept back down the stairway, one step at a time. As they neared the bottom, they turned their head torches towards the end of the tunnel and the platform beyond, and then all sense of reality left them.’

When Rich stumbles upon a secret Victorian underground network, he sees not only a great historical discovery, but also a way out of his humdrum life. He convinces three of his friends to join him, and together, they venture deep into the maze of tunnels beneath London’s bustling streets.

A rude girl made good. An aspiring writer. A cinema usher from Wales. A bookseller who dreams of being an urban explorer. Four friends trapped together in one nightmarish situation as they realise some things are kept secret for a reason.

Will any of them manage to escape the horror that lurks in the Deep Level?