The Secret of Ragnar's Gold

In Book Two of the After School Detective Club series, Joe's exciting Easter plans take a turn when he decides to embark on an adventure with his friends at a mysterious castle that boasts a moat and ancient features. Their exploration soon leads to eerie sounds and odd sightings, culminating in a discovery of an old box containing a treasure map linked to Ragnar's gold, a treasure hidden by a Viking warrior. With a race against time, the friends must navigate the challenges of their surroundings and uncover the secrets of the past before someone else claims the prize.