Thief of Time - Unable

'I used to be able to walk through the walls,' said Susan. 'Can't seem to do it with time stopped. I think the power gets cancelled out somehow.'

'You could really walk through a solid wall?'

'Yes. It's a family tradition,' Susan snapped. 'Come on, let's go through the museum. At least no one moves about much in there at the best of times.’

***

The Thief of Time - p264