Showing Organize Your Corpses by Mary Jane Maffini

Charlotte Adams is a professional organizer. Nothing is out of place in her closets-but her life's a mess. So she's dumped her cheating ex-fiancé, moved back home to Woodbridge, New York, and started making up to-do lists-some of which include solving the occasional murder.

Charlotte's new job has her digging through years of accumulated junk to find some important documents. Instead she finds her client, the meanest teacher in town, dead under a pile of the debris that plagued her. And there's no end to the list of suspects-starting with Charlotte herself.