When he had finished,he brought two papers across to Nisbet.He asked him to sign the first one,which was Nisbet's own de- scription of the picture,then to read the other one,which was the note Williams had written the night before.
'What can it all mean?'asked Nisbet.
'That's what I must find out,'said Williams.'Now,there are three things I must do.First,I must ask Garwood exactly what he saw when he looked at the picture last night,then I must have the picture photographed before it goes any further and,thirdly,I must find out where this house is.'
'I can take the photograph for you myself,'said Nisbet. 'But,you know,I think we are seeing something terrible happening here.The question is,has it already happened or is it going to happen?You really must find out where this house is.'He looked at the picture again and shook his head.'I think you are right,you know.He has got in.I'm sure there will be some trouble in that house.'
'I'll tell you what I'll do,'said Williams.'I'll show the picture to old Doctor Green.He grew up in Essex and he often goes to Sussex to see his brother who lives there.He's been going there for years.He must know both places quite well.'
'That's a very good idea,'agreed Nisbet.'But I think I heard Green say that he was going away this weekend.'
'You're right,said Williams.'I remember now—he's gone to Brighton for the weekend.I'll leave a note asking him to see me as soon as he returns.Meanwhile,you take the picture and photograph it and I'll see Garwood and ask him what he saw when he looked at it last night.'He paused.'You know,'he added,'I don't think twenty pounds is too much to ask for this picture,after all.'