Siobhan Sloane, a shy and naive girl from Nottingham, is uprooted from her simple life when her magic manifests. Under the mentorship of Professor Fig, she travels to Hogwarts, not realizing her life will never be the same. Homesick and burdened with a responsibility she never wanted, Siobhan struggles to acclimate to the wizarding world. Preoccupied with finding a cure for his twin sister, Sebastian Sallow pays little attention to the new fifth year until their paths converge, and an unlikely bond forms. Together, they investigate the mystery surrounding Siobhan's ancient magic, and unearth long-forgotten secrets that the school would rather remain buried. Despite the danger and warnings from new found friendships, Siobhan is compelled to chase after the truth, even if it kills her. L'appel du vide-it is the call of the void. Sebastian Sallow x F!MC | Third Person, Alternating POV | Canon-Divergent | Aged-Up Characters (Please read the Author's Note for a comprehensive understanding of themes and additional tags) cover art by flamboyantjelly