After escaping from their runaway caravan, Violet and Klaus travel through the Mortmain Mountains trying to find their sister, Sunny, who had been kidnapped by Count Olaf.
While running away for snow gnats, the two eldest Baudelaire children find a cave full of Snow Scouts, Carmelita Spatz, and a very furtive dame.
The Baudelaires found out that the very furtive dame is actually Quigley Quagmire, one of their friends' triplet brother, and is also in search of the secret V.F.D. headquarters in the Mortmain Mountains
After finding the secret headquarters of V.F.D. in the Mortmain Mountains, Violet, Klaus, and Quigley see green smoke at the top of Mt. Fraught.
After having seen the green smoke, Violet and Quigley decided to climb up Mt. Fraught, and Klaus decided to stay in the secret headquarters to see if he can find and decipher any codes..
On the top of Mt. Fraught, Violet and Quigley found the missing Baudelaire sibling. They also found Count Olaf, his evil acting troupe, and another pair of evil villains.