Revenge R US by R.L. Stine

Iris reached over and shook hands with me. Her long black fingernails scraped my palm. Then moving her lips silently, she rubbed the crow's back, once, twice and three times. Her eyes shot open. There it is done. A lovely little revenge. Your brother will have a terrible accident and he'll never recover. No, I wailed. No please! That's not what I want! Take it back! Take it back! Sorry, Iris said coldly. It's too late.