"'Did you put it up before you went down to your bedroom?'
"'I puts it up regularly every night.'
"'And you did so last night?'
"'Yes.'
"'And turned the key?'
"'Yes.'
"'Was the door locked and the chain up the first thing this morning?'
"'Yes--no!'
"'What do you mean by that?'
"'I mean I can't remember. I must be sure, mustn't I, sir?'