Rose sat with the letter pressed to her chest, tears sliding down her face. But there was no surprise in her grief, only recognition. Rose already knew such a letter might exist. Years ago, before she ever set foot in Blackthorne Manor as a governess, Eleanor had told her about writing something like it, a promise tucked away in case the worst ever happened.

Rose had hoped she would never have to find it.

She folded the letter carefully and slipped it into her pocket instead of bringing it to the Duke. She told herself she needed time, that the Duke had only just begun to trust her, and a letter like this, proof that she may have known Eleanor long before arriving at his door, could unravel everything too quickly. Hiding it changed nothing. It only delayed what Rose already knew was coming.

Later that evening, while placing returned books back on a high shelf, Rose knocked loose an old framed portrait tucked behind a row of novels. It fell, the glass cracking against the floor. She knelt to gather the pieces and froze. The portrait showed a much younger Eleanor, perhaps eighteen, standing in a garden Rose did not recognize.

Beside her, arm linked with the future Duchess, unmistakably and impossibly younger, was Rose herself.

Rose stared at her own face looking back at her from years ago. For a long moment, she did not move. She had hoped this portrait no longer existed, that no evidence remained of the years before Blackthorne, before the promise, before everything went wrong. Footsteps sounded in the hallway outside.

Rose scrambled to hide the broken frame beneath a stack of books just as the door creaked open. It was only a maid passing by, gone in seconds. Rose exhaled, her heart still hammering. She wrapped the portrait in cloth and hid it inside her trunk beside the letter, telling herself she would find the right moment to explain everything.

But some secrets do not wait for the right moment. They find their own way out.

The Duke had not meant to search Rose's things, but Mrs. Pratt mentioned a broken picture frame missing from the library, and something in his gut tightened. He went to the library himself, checked the shelf where it once hung, and found only dust in its place. Somehow, before he even opened Rose's trunk in the governess's quarters, he knew what he was going to find.

The portrait. Eleanor, young and laughing, arm-in-arm with a girl who was unmistakably Rose Winthrop. Beneath it, the letter.

He read his late wife's words in a room that suddenly felt too small to breathe in. To the woman who will one day care for my son. His hands shook by the time he reached the end.

When Rose returned from the gardens with Charles that evening, the Duke was waiting in the hallway with the letter and portrait in hand. Charles was quickly sent off with Mrs. Pratt. The Duke's voice, when it came, was low and sharp.

"How long have you known my wife?"

Rose did not try to lie. There was no point anymore. "Since we were girls," she said quietly. "I was her companion before she married you. Her closest friend."

"And you said nothing."

The betrayal in his voice cut sharper than anger. "You came into my house, into my son's life, and you said nothing."

"Because I didn't know how," Rose admitted. "Because I was afraid you'd send me away before I ever had the chance to keep my promise."

"What promise?"

Rose closed her eyes, and the whole truth finally spilled out. The night before Eleanor's wedding, she had pulled Rose aside, gripping her hands so tightly it left marks. She had been strangely afraid that night, Rose recalled, afraid in a way brides should not be.

Eleanor made her swear one thing. "If anything ever happens to me, find Charles. Find our son before grief destroys him."

Rose had promised without understanding why it mattered so much. She did not learn the truth of that fear until a year ago, when news reached her that the Duchess was dead. She came to Blackthorne Manor as soon as she could, only to be turned away at the gate by Eleanor's relatives, who told her the Duke wanted no reminders of his late wife in the household. She was dismissed before she ever saw the Duke or Charles.

It took her nearly a year and a false name on a governess registry to finally find her way back through the front door.

"I didn't lie to hurt you," Rose said, tears slipping free. "I lied because I was terrified of losing him again, losing Charles before I ever had the chance to keep my word to her."

The Duke stared at the letter in his hands. Then at the woman before him, no longer a stranger, but someone who had carried his late wife's last wish farther than he ever knew. The anger in his chest, the suspicion he had been holding since the chapel, drained out of him all at once. He sat down heavily, the letter still trembling in his grip.

For the first time since he buried Eleanor, since the funeral, since the silence swallowed his house whole, Duke Edward Sinclair wept.

Rose did not move to comfort him. She only stayed quiet, letting him grieve the wife he lost in a way he had never allowed himself to grieve before. When he finally spoke again, his voice was hoarse.

"She trusted you with our son before she trusted anyone else."

"She trusted you, too," Rose said softly. "She just needed to make sure Charles would be loved either way."