The secret of the lava prince

This book is about Tuomas, a Finnish schoolboy of Sicilian descent. He lives between two worlds: as the heir to the eternal Lava People and as a descendant of the human race. He is unable to choose between the two. If humanity deserved it, Tuomas could do a lot of good with his supernatural powers. Since his mother's tragic accidental death, Tuomas has lived with his grandmother in a mansion in the Finnish village of Arvola. He is constantly surprised by his extraordinary abilities and powers. He gradually discovers his connection to a mysterious people who live deep within the Etna volcano in Sicily.