An inquisitive boy named Xavier with his sister Yadina and friend Brad accidentally found a completely different Secret Museum under the building of an ordinary museum. There are also shelves with exhibits, but they are unusual, but magical. This secret room is capable of transporting everyone who is in it in time, where you can learn a lot of interesting things. In the game Hidden Heroes, along with the characters you will meet different famous people who lived in the past and even the year before last. Musicians, writers, poets, scientists will ask children to find for them instruments, books, and other items.