The Dragon’s Lost Letters by Zoe Chant

He’s looking for his darkest secret … in her stacks!

Valentine is a red dragon shifter on the hunt for something more valuable than rubies. He needs to recover some highly sensitive documents that went missing more than a century ago. He didn’t expect to find his true mate instead …
Dusty books and old documents are archivist Norah’s one true love. Or so she thinks, until a gorgeous guy looking for help walks into her office — and into her heart.
Maybe he can help her out with something too. There’s a book thief running around Norah’s library, and too-hot-to-handle Val might be just the person to help her set a book thief trap.
And she can suggest a few things he can rearrange on her shelves while he’s at it.