Moon Princess — Kathleen S. Allen

Sixteen year old Delia wants to do something different to celebrate her seventeenth birthday---so she gets a tattoo of a design someone painted on a rock she found in her school locker. When the tattoo begins glowing in the dark and pulsing, she knows something is wrong. She discovers her mother's quiver of arrows, her bow and her dagger in the attic. Who was her mother? Why did she have these things? Delia's journey of discovery takes her to a deserted island off the coast of Greece to battle mythological creatures and to the Underworld of Hades to rescue those she loves.