Sihja is a charming and outrageous young fairy who leaves her forest home for the city where she soon makes a new friend. Alfred is 11 years old and he’s feeling lonely and sensitive. These two unlikely friends quickly bond and enjoy fun in the city until dead birds begin to appear on the streets. At first, it looks like the smelly fertilizer factory and its director Lisbeth Spiderville could be responsible. However, when Sihja reveals her true fairy powers, people begin to fear her and blame her fairy magic.
Now it’s up to Alfred – whose father works at the fertilizer factory – and Sihja to find out who is behind the threat to their city. Thanks to a clever and courageous investigation, they manage to prevent an environmental disaster. With a little help from Alfred, Sihja learns to master her superpowers and she helps Alfred to find the confidence to stand up for himself.