Ola and the Sea of Magic

When a terrifying, lurid green cloud spreads over their garden, Ola knows that another adventure won't be far behind. And sure enough, shortly afterwards, the miniature giant Mr Lilienthal disappears without a trace from his apple tree! All signs point to him having been kidnapped. Ola and the pixie Casimir immediately plan a rescue mission. But this operation is risky and their opponents are powerful. Will they manage to free the little giant from the mysterious mountain, where countless dangers lurk?