Dangerous Deeds by Beth Prentice

Lizzie Fuller has a passion for fixer-uppers, so when she stumbles across a cache of old letters along with an engagement ring hidden under the attic floorboards of her latest project, her interest is piqued. Who hid them there, and why?
Working alongside her hunky handyman is proving to be quite the distraction, but Lizzie is determined to solve the puzzle of the long-lost love affair. Only things take a sinister turn when she discovers someone watching her from the shadows. Is the stalker somehow connected to the letters and ring? Or is Lizzie the target of something more sinister?