Entitled "Son of a Witch," the new tome is scheduled for a Sept. 27 release. The novel follows the story of Liir, Elphaba's young son who is left behind after her death.

According to notes on Maguire's official website, "Son of a Witch" is set a decade after the demise of the green-faced witch. "The young man Liir is discovered bruised, comatose, and left for dead in a gully. Shattered in spirit as well as in form, he is tended by the mysterious Candle, a foundling in her own right, until failed campaigns of his childhood bear late, unexpected fruit.

"Liir is only one part of the world that Elphaba left behind. As a boy hardly in his teens, he is asked to help the needy in ways in which he may be unskilled. Is he Elphaba’s son? Has he power of his own? Can he liberate Princess Nastoya into a dignified death? Can he locate his supposed half-sister, Nor, last seen in shackles under the Wizard’s protection? Can he survive in an Oz little improved since the death of the Wicked Witch of the West? Can he learn to fly?"

The list price for "Son of a Witch" is $26.95. Amazon.com is currently taking pre-orders for the tome, at a discounted price of $17.79.

Wicked, which varies slightly from the original Maguire novel, continues to play Broadway's Gershwin Theatre.