Anima Summa is a trilogy. The Anima summa is a beeing of light (Harry and Hermione) that can oppose the dark side by use of ancient knowledge.
In the first book Harry and his band has to solve the Mystery of Rhedae (Rennes les Chateaux) and find his live partner (his Anima Summa Herminie). The Involves the Priory of Sion, the Sauniere family and the quest for the Holy Grail. The solving of the mystery results in the knowledge of ancient spells.
In the second Part they have to find „the original scribe“ – the origin of writing and wisdom. They are looking on ancient sites in Greece, Rome, Wales and Egypt. Parallel Voldemort learns ancient spells that increase his power; he also contacts ancient demons.
The final book leads them over Iraq, Turkey, the Caribbean to Atlantis (on Flores on the Antilles) where they learn the origin of magic. The school is closed and they settle down in a hidden valley in Wales they formerly sought out. The final showdown is in the stone city of Petra (Syria).
The books can be read online at Schnoogle.
I also made PDFs out of the books: Anima Summa 1 – The Mystery of Rhedae, Anima Summa 2 – As Above so Below and Anima Summa 3 – Into the Light