She would soon know what it all meant.  Thyrza and she left the house together and went in opposite directions.  Lydia crossed Kennington Road, and found Luke waiting for her.  She approached him with veiled eyes.

‘I’m so glad you’ve come,’ he began, with signs of disturbance, ’It’s kind of you to come.  I have a great deal to say, and I can’t speak here.  Will you come round into Walcot Square?—­it’ll be quieter.’

She said nothing, but walked beside him.  It was a new and strange sensation to be thus accompanying Ackroyd.

She was conscious that her pulses quickened.  They went on in silence till they reached the spot which Luke had mentioned, an irregular little square, without traffic, dark.

‘I don’t know how to begin to tell you, Miss Trent,’ Ackroyd said, when he stopped and turned towards her.  ’It’s your sister I have to speak about.’

She had foreseen truly.  Her heart sank.

‘What can you have to say about my sister, Mr. Ackroyd?’ she asked in a hard voice.

’I’m not surprised that you speak in that way.  I know that I shall seem a busybody, or perhaps something worse, meddling with things that don’t concern me.  It would be easier for me to leave it alone, but I couldn’t do that, because I can’t think of you and your sister as strangers.  I’ve heard something said about Thyrza that you ought to know.  Be friendly to me, and believe I’m only telling you this because I think it’s my duty.’

Lydia was looking at him in astonishment.

’You’ve heard something?  What?  What has anybody to say about my sister?’

’I shall make no secret of anything—­it’s the only way to prove I’m behaving honestly to you.  I was at the club last night, and Bower came and sat down by me, and he began to talk about Thyrza.  He said it looked strange that she should be alone with Mr. Egremont in the library every morning.  The woman that takes care of the place told him about it, and he’s seen Thyrza himself coming away at dinner-time, when Mr. Egremont was there.  He says she goes to help him to put books on the shelves.  He spoke of it in a way that showed he was telling the story to all sorts of people, and in a way that means harm.  I’d sooner bite my tongue out than repeat such things about your sister, if it wasn’t that you ought to know.  I might have told Grail, but I felt it was better to see you first.  I know I’m making trouble enough any way, but I believe you will give me credit for acting honestly.  Don’t think of me as the kind of man I’ve seemed since Christmas.  You used to think well of me, and you must do so now, Miss Trent.  I’m speaking as a true friend.’

He hurried out his words of self-justification, for he saw the anger in her face.

‘And you believe this?’ Lydia exclaimed, when she could use her voice.  ’You believe a man that will go saying things like this about my sister?  Why is he trying to do us harm?  Why, there is no books to put on the shelves!  No books have come to the library yet!’