Chamber of Nothing is part of the HEROES series, created with series editor Frank Cottrell Boyce.

Set in the tunnels beneath the city, a group of students go on a school outing they'll never forget.

As the group descends the rickety staircase to begin the Hidden City tour they are at first, disappointed by the bland warren of bare brick chambers.

But the atmosphere soon becomes far more sinister as each chamber is explored and the tour guide describes its history of horror.

As the stories become spookier, mass hysteria erupts and the tour has to be abandoned...but does everyone return safely?