Demelza & the Spectre Detectors

‘Lights out, Demelza!’ called Grandma Maeve from the bottom of the attic stairs. ‘And no sneakin’ out of bed to work on your inventions again tonight, d’ya hear me?’
Under her patchwork quilt, with soldering iron in hand and fully dressed in her lab coat, Demelza grinned. ‘Yes Grandma!’ she called back. ‘I promise!’
‘And that means no stayin’ up late reading them big science books of yours either, you understand?’
‘Yes, Grandma! See you in the morning!’

Demelza switched off her bedside lamp, and through the darkness listened to the creak of the landing floorboards below as Grandma Maeve hobbled back to her own
bedroom. There was the rustle of curtains being drawn followed by the thud of slippers being kicked off, and