Fire and Fog — Dianne Day

With her intrepid debut in The Strange Files of Fremont Jones, audacious Fremont (nee Caroline) Jones proved herself an investigator as perspicacious as Sherlock Holmes and as spirited as Kinsey Millhone. Now, in the aftermath of the great San Francisco earthquake and fire of 1906, Fremont finds herself once more drawn into a wealth of mystery, romance, and deadly peril....

A locked storeroom proves too fascinating for Fremont Jones to ignore but the knowledge of what lies inside could lead to terror. Befriending shy, sweet Alice Lasley seems the right thing to do, until Fremont discovers that Alice--and her missing husband--are not what they seem. And when someone begins leaving loathsome offerings at her front door, Fremont's efforts to learn the truth entangle her once again with the disturbingly attractive Michael Archer...as she steals through the charred rubble in pursuit of a killer who would, in a trice, find a way to extinguish her.