Nina loves listening to the stories her father tells her to fall asleep, tales of a hedgehog discovering the world. One evening, her father, preoccupied with work, doesn’t come to narrate a new adventure… Luckily, her best friend Mehdi is there to help find a solution: what if the treasure hidden in the old factory could solve all their problems? Thus begins a grand adventure where they must escape the old neighbor and her fluffy cat, outsmart the guardian’s traps, and deceive his big dog… Not to mention the little hedgehog who is investigating alongside them !