Talk of the Sídhe is taboo in her house. But a sneak look at a chart of her family tree puts Aisling in detective mode. Her grandmother, Bláithin, had disappeared long ago and was presumed dead. Were the hot-tempered volatile Sídhe behind it? This Hallow'een she trespasses on their land and plunges headlong into their madcap subterranean otherworld. The capricious, malicious sídhe force a stinging potion (Helleboraster Maximus) down her throat, shrink her small enough to fit in a sliotar, puck her about senseless in a hurling war, and chain her newly found friend Fachtna to the dungeon walls on death row. Risking everything, she sets out to rescue Fachtna and Bláithín before undertaking her own perilous escape. This tale steeped in Irish mythology will delight readers of all ages.