The Mansion Awaits Spring

"I have found someone I love."
April is unilaterally dumped by her fiancé.
To the people of the Grand Duchy of Dieus, an engagement was a sacred promise to become lifelong companions. Therefore, killing the man who betrayed their daughter was deemed a rightful duty for any parent.
However, the assassination attempt ends in failure. In retribution, the Lord and Lady of House Lunos are sentenced to hang, while April, still a minor, receives a seven-year sentence of solitary confinement.
Seven years later, having served her time in full, April desires only one thing:
Honor.
The very honor her parents risked death to protect—the honor of herself and her family, House Lunos.
For that, she was more than willing to live up to the expectations of a world that already branded her a villain.
But then...
"You are under arrest for the serial murders committed over the past three years."
Armed police blockade the front of her mansion. Worse yet, they are framing her for crimes she couldn't possibly have committed while locked away for the last seven years.
"...Of course, it’s a Dieus again."
April murmurs, staring at Phejin—the younger brother of her ex-fiancé—who stands at the forefront of the police.
What exactly is Phejin Dieus's motive for showing up at her estate? And will April be able to clear her name and revive her fallen house?