Robert may need me.

Do not let us waste any more time." She slipped past him to Thalassa, who was mounting the stairs.

Dr.
Ravenshaw hurried after her.

Mr.Pendleton, with an obvious call on his courage, followed last.

The lamp in Thalassa's hand burnt unsteadily, first flaming angrily, then flickering to a glimmer which brought them to a pause, one above the other on the stairs, listening intently, and looking into the darkness above.
"His bedroom is open and empty," said Thalassa when they had reached the end of the passage above.