POSTERN OF FATE Agatha Christie

'Now the next sentence made is: It was one of us, I think I know which
one. That's all. Can't find anything else. But it is rather exciting, isn't
it?'
'Look here, Tuppence,' said Tommy, 'you're not going to get a thing
about this, are you?'
'What do you mean, a thing, about this?'
'Well, I mean working up a sort of mystery.'
'Well, it's a mystery to me,' said Tuppence. 'Mary Jordan did not die
naturally. It was one of us. I think I know which. Oh, Tommy, you must
say that it is very intriguing.'
Chapter 3
VISIT TO THE CEMETERY
'Tuppence!' Tommy called, as he came into the house.
There was no answer. With some annoyance, he ran up the stairs and
along the passage on the first floor. As he hastened along it, he nearly
put his foot through a gaping hole, and swore promptly.
'Some other bloody careless electrician,' he said.