But we might try.' So they tried.

But the blank silence of the damp dungeon remained unchanged.
'What was the name the Queen said ?' asked Cyril suddenly.
'Nisbeth--Nesbit--something?
You know, the slave of the great names ?' 'Wait a sec,' said Robert, 'though I don't know why you want it.
Nusroch--Nisrock--Nisroch--that's it.' Then Anthea pulled herself together.

All her muscles tightened, and the muscles of her mind and soul, if you can call them that, tightened too.
'UR HEKAU SETCHEH,' she cried in a fervent voice.

'Oh, Nisroch, servant of the Great Ones, come and help us!' There was a waiting silence.

Then a cold, blue light awoke in the corner where the straw was--and in the light they saw coming towards them a strange and terrible figure.