Marion paused beside her table, splaying her fingers on its surface for support. There was a faint sheen of perspiration on her forehead, which was creased by a frown, as if she were trying to make sense of something. She grimaced suddenly, raising a hand abruptly to her mouth and reaching with the other for her chair. But before she could grasp it she staggered, and her hand knocked the vase of flowers to the floor. She doubled over with a moan and sank to her knees.

‘Oh!’ Her cry was cut off as she was abruptly sick, her body convulsing violently, sending the chair tumbling onto its back.

Consternation spread out in ripples across the Reading Room, people rising to their feet, craning to see what had happened. But Nigel remained where he was, eyes bright, phone in hand, fastidiously recording every detail. She was being sick again, poor thing, writhing in agony as she vomited over the red carpet.

One of the librarians was running forward. ‘What is it?’ she demanded. ‘What’s wrong?’

A man who had been seated at her table said, ‘She… she’s having some sort of attack,’ shrinking back with a look of horrified pity on his face. Last to respond, the two old codgers in the armchairs in front of the fireplace had belatedly risen to their feet. Everyone’s attention was focused on the epicentre of the drama, unaware of Nigel taking surreptitious pictures of Marion thrashing about helplessly on the floor, and of the shock on people’s faces as they witnessed this awful scene, all of them struck by the same terrible realisation that such a thing, whatever it was, could happen to anyone, at any time, even here in this sanctuary.