WELCOME TO
THE MYSTERY AT THE MUSEUM

An exhibition of old movies had opened at Kopiraittila Museum. Anni and Joshua’s class was invited to see a show at the museum. However, when they arrived, they found a police car in front of the museum.
What had happened?

Each QR-code puzzle, when solved, gives you a character. Together they form a code.
Input the code below and find out who's guilty.