"Okay, so you've got Cam and Amariah and Shell Bell and Amariah's boyfriend and one of his alts all prowling the afterlife, checking the place out, talking to the shades of the dead, looking for harpies - the alethiometer warned them about harpies but it was really vague, it explained that there was some thing in the afterlife that 'hungered for truth' and 'had knowledge' and 'caused suffering', you can see why they would not immediately think 'harpy with guilt-screech attack'. And then Shell Bell found one. And it screamed at her." Bella pauses dramatically.