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In the organizer's words:

Luckily it's a big birthday

Niko runs around the apartment excitedly because the guests are about to arrive. It's his eighth birthday and he wants to celebrate! He has invited his best friends Miray and Karl. His mother had to go to work today, but his father is helping him with the preparations. When everyone finally gathers in the living room to sing the birthday song, the doorbell rings: The neighbor's girl is at the door, of all people! She has accidentally locked herself out of the apartment. Niko's father invites her in so that she doesn't have to wait for her mother alone in the hallway. It's hard for Niko to say no. An argument seems inevitable and the party he had imagined so beautifully turns out to be pretty much out of control over the course of the afternoon.
At the end of the day, the children not only find a treasure, but also reconnect with each other in unexpected ways.