Guess the Book Title!

What book am I quoting from?

He walked right around the cave, touching as much as the rough rock as he could, occasionally pausing, running his fingers backwards and forwards over a particular spot, until he finally stopped, his hand pressed flat against the wall.
'Here,' he said. 'We go on through here. The entrance is concealed.'
He stepped back from the cave wall and pointed his wand at the rock. For a moment, an arched outline appeared there, blazing white as though there was a powerful light behind the crack.

still wondering? try this bit:

...a dead man lying face up inches beneath the surface: his open eyes misted as though with cobwebs, his hair and robes swirling around him like smoke.
'There are bodies in here!'

Anybody? Anybody?