Curator and occasional sleuth Chloe Ellefson is off to Minneapolis to help her friend Ariel with a monumental task. Ariel must write a proposal for a controversial and expensive restoration project: convert an abandoned flour mill, currently used as shelter by homeless people, into a museum. When a dead body is found stuffed into a grain chute, Chloe's attention turns from milling to murder.

Back in Milwaukee, Chloe's love interest Roelke has been slammed with the news that a fellow officer was shot and killed while on duty. Sifting through clues from both past and present, Chloe and Roelke discover dangerous secrets that put their lives—and their trust in each other—at risk.