Title: The Masquerade (de Warenne Dynasty)
Description: (de Warenne Dynasty #5) 

On the evening of her first masquerade, shy Elizabeth Anne Fitzgerald is stunned by Tyrell de Warenne's whispered suggestion of a midnight rendezvous in the gardens. Lizzie has secretly worshiped the unattainable lord for years. When fortune takes a maddening turn, she is prevented from meeting Tyrell. But Lizzie cannot foresee that that night is only the beginning ... 

Tyrell de Warenne is shocked when, two years later, Lizzie arrives on his doorstep with a child she claims is his. He remembers her well --- and knows that he could not possible be the father. What is this game she is playing ... and why? Is Elizabeth Anne Fitzgerald a woman of experience, or the gentle innocent she seems? But neither scandal, deception nor pride can thwart a love too passionate to be denied ...

Note- The deWarenne Dynasty is very vast and spans through multiple series, they can be read stand alone.* In chronological order, followed by the books that are distantly related

The Conqueror (deWarenne Dynasty, #1)
Promise of the Rose (deWarenne Dynasty, #2)
The Game (deWarenne Dynasty, #3)

Regency Era:
The Prize (deWarenne Dynasty, #4)
The Masquerade (deWarenne Dynasty, #5)
The Stolen Bride (deWarenne Dynasty, #6)
A Lady at Last (deWarenne Dynasty, #7)
The Perfect Bride (deWarenne Dynasty, #8)

Victorian Era:
A Dangerous Love (deWarenne Dynasty, #9)
An Impossible Attraction (deWarenne Dynasty, #10)
The Promise (deWarenne Dynasty, #11)

Contemporary Era:
House of Dreams

Related books:
Scandalous Love (Bragg Saga, #6)
After Innocence (Delanza, #2)
The Awakening (a novella included in the anthology Heart of the Home)
Subjects: Illegitimate children, False personation, Deception, Fiction, Fiction, romance, historical, general, Historical Romance, Fiction, romance, general, Regency romance
Places: England
People: The deWarenne Dynasty, Tyrell de Warenne, Elizabeth Anne Fitzgerald
Time periods: Regency Era