Showing Trick or Treat by Lesley Glaister

All Nell's life, Olive Owen has lived next door but one. And all her life, Nell has hated her. Even at school Olive had sparkled indecently, turning heads. Nell has a son, her pleasure and her shame, though now she lives alone. Nell is sharp in all the places Olive is round.

When Wolfe moves into the house in between them, their quiet street is transformed. A lonely, spirited eight-year-old boy, he knocks on their doors at Halloween and invites them to his bonfire party. As the fireworks flare, he finds himself in the middle of an ancient conflict, grudges bared and burning with a fury he could never have imagined.

'A perfect, black little tale' Observer