Elminster's Daughter: Forgotten Realms: Elminster, Book 5

A woman scorned...

All her life, Narnra of Waterdeep wondered who her father is. Amid the squalor of the streets, through the danger she faces daily as a thief in the City of Splendors, she speculates on whom the mysterious wizard might be who left her mother to raise a fatherless child.

Now she's discovered that it's no less a person than Elminster of Shadowdale, mightiest mage in all Faerian. And her anger is as boundless as his power.