The twins Alexander and Alexandra, and their parents, inherit a house from suddenly and inexplicably deceased relatives. Uncle Reggie and Aunt Henny hadn't been close relatives lately, so this inheritance is quite surprising.

A suitcase is the twins' legacy, which looks like a very small thing, but with the items they find inside it, a new world is opening for them, and that in the most literal way. The Other World gets them in touch with magic and a lot of information about what their uncle and aunt had been doing.

Meet Xander and Lex, who have a special connection to the twins, and Olga, a friendly witch with her own ways of doing things. Follow the twins on a tour of discovery into the OtherWorld and a Secret Cellar, where surprises, revelations and dangers await them.