Violet (Malina Weissman), Klaus (Louis Hynes) and Sunny are three siblings who are as close as brothers. Violet's head is full of quirky ideas, Klaus is well-read and can remember everything he has seen. Although Sunny is young, he has four white and strong front teeth, and his fighting power should not be underestimated. An accident made the three siblings homeless orphans. In order to find a reliable new home for themselves, the three embarked on a journey. The distant relative Count Olaf (Neil Patrick Harris) adopted the three, but soon Violet discovered that what Olaf really wanted was actually the huge inheritance left by their father. For this reason, the evil Olaf even planned a car accident in an attempt to kill the three children.