Em Hansen Books in Order

Where to Start Reading the Em Hansen Series

For the best reading experience, you should start the Em Hansen series at the very beginning with Tensleep (1994). Unlike episodic procedural mysteries where characters remain stagnant, Em Hansen’s journey is highly serial. Over the course of eleven novels, Em matures from a young, isolated mudlogger fighting for respect in the male-dominated Wyoming oil fields into a polished forensic geologist working alongside federal investigators. Her personal relationships, career milestones, struggles with grief, and professional evolution develop sequentially. Reading these books out of order will spoil major character arcs, particularly the trajectory of her love life and career milestones.

Em Hansen Publication and Recommended Reading Order

Because the internal chronology of the series aligns perfectly with the order of release, the publication order is the recommended reading path. Below is the complete list of Sarah Andrews' Em Hansen novels, complete with their geological themes and settings:

1. Tensleep (1994): Set in the harsh Wyoming oil country, this debut introduces Em as a mudlogger on a drilling rig. When suspicious fatal accidents claim her colleagues, Em uses mud chemistry and drill-cutting analysis to uncover sabotage.
2. A Fall in Denver (1995): Em moves from the remote oil fields to the high-stakes corporate headquarters of Blackfeet Oil in Colorado. Navigating corporate misogyny and complex politics, she investigates a series of apparent employee suicides.
3. Mother Nature (1997): Hired by a U.S. senator, Em travels to Santa Rosa, California, to investigate the death of his daughter at an environmental cleanup site, dealing with soil contaminants and groundwater pollution.
4. Only Flesh and Bones (1998): Returning to her roots on a Wyoming ranch, Em helps an oil magnate look into the suspicious death of his wife. This installment focuses heavily on forensic taphonomy, soil layers, and long-buried family secrets.
5. Bone Hunter (1999): Attending a paleontology conference in Salt Lake City, Utah, Em is framed for the murder of a leading scientist. To clear her name, she must untangle a dangerous conspiracy involving fossil poaching and black-market antiquities.
6. An Eye for Gold (2000): Set in the Nevada desert, Em evaluates a massive gold-mining project. The stakes turn deadly when she uncovers conflicts between mining interests, environmental regulations, and endangered species protection.
7. Fault Line (2002): Against the backdrop of the Salt Lake City Winter Olympics, Em investigates a murder linked to earthquake safety, seismic engineering, and construction politics.
8. Killer Dust (2003): Searching for her missing FBI agent boyfriend, Jack Sampler, Em's investigation takes her from the American West to Florida and the Bahamas. The plot revolves around air sampling, national security, and airborne particulates.
9. Earth Colors (2004): In a change of pace, Em is tasked with authenticating a historic painting attributed to Western artist Frederic Remington. She employs mineral pigment analysis and art forensics to solve a puzzle that turns lethal.
10. Dead Dry (2005): Working as a forensic geologist for the state of Utah, Em probes the death of an environmental activist crushed at a gravel quarry. This novel explores hydrology, water rights, and development conflicts.
11. Rock Bottom (2011): The final entry in the series takes Em to the Grand Canyon. Immersed in deep-time stratification, Em faces her most challenging case yet, bringing a satisfying resolution to her personal and professional journey.

Chronological Caveats and Character Continuity

There are no prequels or timeline jumps to worry about in this series. The timeline progresses naturally over a span of nearly two decades. When reading, keep in mind that the books reflect the technology and industry practices of their respective eras—from the dial-up internet and paper maps of the mid-1990s to the advanced digital forensic tools of the 2010s. The emotional weight of Em's past decisions accumulates, so skipping books like Only Flesh and Bones or Killer Dust will leave readers confused about her relationship status and career moves in later entries.

The Valena Walker Spin-Off: In Cold Pursuit

In 2007, Sarah Andrews published a standalone mystery titled In Cold Pursuit. This novel introduces a new protagonist, Valena Walker, a master's student in geology who travels to McMurdo Station in Antarctica to study glaciology, only to find herself investigating a murder. While it is not a direct Em Hansen novel, Em Hansen makes a notable cameo appearance, serving as a mentor and advising Valena via email and phone. It is highly recommended as a companion read after Dead Dry.

What to Know Before You Start

Sarah Andrews was herself a professional geologist, having earned degrees from Colorado College and Colorado State University before working for the USGS and private oil firms. This authentic background shines through in every book. The science is rigorous but explained in an accessible way, making the Earth itself a central character. If you enjoy procedurals by Kathy Reichs, Patricia Cornwell, or the Southwestern mysteries of Tony Hillerman, you will appreciate how Andrews merges scientific logic with classic detective work.