The Worlds of Magic and Myths - Book One - The Missing Sword

Chiron and an old friend of his have taken it upon themselves and chose 10 students each to attend a highschool together. But something's up with the two female demigods from Camp Half-Blood and Camp Jupiter. All the other students know them, and that includes the students from this old friend of Chiron. Can the demigods trust these two? I guess we'll have to find out as the twenty students unravel a mystery of a missing sword increasing important to a demigod.