Carved stone

Sam's father often disappeared for a few days, but after that he always returned with a pile of gifts and told incredible stories. This time, I haven't heard any news from dad for more than a week...

Desperate to find a clue in their bookstore's pantry, the boy discovers a secret passage, and beyond it a strange book with an even more bizarre carved stone. And if Sam sticks a coin in this stone, he finds himself far in the past. First in Viking-attacked Scotland, then in Ancient Egypt, and even in Dracula's castle! The boy will have to deal with the secrets of the past, because everything will end only when Sam saves his father, or loses him forever in time...