The three siblings lost their parents in a fire and inherited a large inheritance left by their parents. Because they are still young, they can only use the money when they reach the legal age. So, the three siblings were temporarily taken to the home of their distant relative Olaf (Jim Carrey) and raised by Olaf. Sister Violet (Emily Browning) is an elf who is good at inventing and creating, and brother Klaus is knowledgeable and a genuine little doctor. The youngest child has sharp teeth and speaks words that only his sisters and brothers can understand. This time, the three siblings fell into Olaf's trap and were targeted by this greedy relative for the inheritance. They fell into danger again and again, and it seemed that Olaf had to kill them. So they fled to their uncle's house as a biologist, but it was full of snakes and animals, which was quite scary. What's worse is that Olaf followed like a shadow that he couldn't get rid of. The three children continued to escape, and when they found that their aunt's house was not a place to go, they decided to be self-reliant and deal with the evil Olaf to the end.