The Secret of the Stolen Mask

Johanna is amazed when her grandfather Kito from Tanzania unexpectedly comes to visit. At a museum, Kito notices a mask that reminds him of a long-lost cultural artifact from his village. Shortly thereafter, that very exhibit is stolen. The police suspect Kito. Johanna is nonetheless convinced of his innocence. With the help of two friends, Sweta and Anton, she sets out to investigate.