It looked like the tunnel might never end. The light spheres would hang about in the air, waiting as they worked through all the obstacles then bounce off along the corridor leading the way.

The tunnel led them straight for quite a while then veered a sharp right.

Mama and Papa paused at the corner.

'Where are we now?' Mama asked in a soft whisper.

'This will take us through the back of the DeNaga wing.'

Mama stared at Papa. 'Is there no other ...