Nova guarding the stones

My precious stones are in a pigeon-hole, where they are watched over day and night by Nova, who I looked after for a little while once. She has enormous ears like a bat. My stones include a flint that I have decided is a stone implement from prehistory, as it fits perfectly in my hand and is as sharp as a dagger. I found it in the garden when I lived in Sussex so it's just as likely to have fallen out of someone's wall but I'm pretty sure it's an implement from prehistory.