So You Want To Be A Wizard by Diane Duane

In this enchanting tale, a young girl named Nita discovers a mysterious book that introduces her to the world of wizardry, where she learns that magic is real and she has the potential to wield it. Alongside her new friend Kit, she embarks on a thrilling adventure through alternate dimensions and encounters fantastical creatures, all while battling the forces of darkness threatening to engulf the universe. As they navigate the challenges of their newfound powers, Nita and Kit learn valuable lessons about friendship, courage, and the responsibility that comes with wielding magic.

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