This is the fourth series of Mistral Winds.
Philip and Jerry are brothers. They started off combating The Mistral Winds that were after the bad blood in their bloodline. It was essential for them to keep their bloodline clean. This bloodline was dated back in the 1400s by Isabelle Castile, she saved the bloodline by bringing goodwill to the ships that sailed on the seas. Before her there was no peace nor kindness. Jerry and Philip had to follow and witness the Mistral Winds. The Mistral Winds chase people who were ruining the Castile bloodline, which included Philip's deceased wife.
After they battled that, they went into Craco, an abandoned ghost town in Italy. Craco had ghosts in the town. They had to battle the ghostly pirates. They worked with the ghostly Monks, and they had the black fog that attacked them. All types of events took place in Craco. Craco is where they found their treasures They found treasures, and they became millionaires, while pirates had buried their treasures in Craco. And now they have a nice boat, and they have been assigned to relieve the children of the sea (Souls of the sea) that are in bondage/chambers. The children sit at the bottom of the sea. And there were pirates down there that were in chambers, mean ugly pirates. They released them into the abyss. The children went to heaven. After rescuing the souls of the sea and fighting the sea monsters and saving the cities of Atlantis (there are seven cities of Atlantis). They save them from the pirates and from the beast that was around trying to destroy their town.
Now Philip and Jerry have a new assignment from Grandpa (Gramps) is what they call him. And Gramps has a big problem, and it's the big Black Sea, over 700 miles (ca. 1,127 km) of Sea The sea is starting to erode. The sea has the City of Atlantis down there and the people are stuck The city is covered with fungus that is starting to collect in the Black Sea. The reason it's called The Black Sea is that there have been numerous deaths. If you go down to the bottom and look at these people who have died, they look like they just died yesterday. Even though they died hundreds of years ago. The Black Sea has a certain preservative in it that keeps everything preserved. All the ships that have sunk into the Black Sea seem like they just sank yesterday. They've been sitting there for hundreds of years. No one touches them because they're so nice. They want to avoid ruining the preserved ships. Philip and Jerry are assigned to go there and spend time to get the fungus cleared, save souls that are in chambers, and battle all mysteries that lie beneath the black waters. Many surprises to behold