Die Drei !!!

In the summer, three friends, Kim, Franzi, and Marie, plan a theatrical rehearsal at a newly restored theater that was previously damaged in a fire. Their plans are soon disrupted by strange occurrences, and they decide to investigate, becoming young detectives in the process. With the help of the theater's director, Robert Wilhelms, and with the guidance of her father, Marie, the trio follows a trail of clues and suspects to uncover the truth behind the mysterious events.