Em Hansen Books in Order

Mudlogger Em Hansen works among a hostile crew at a Wyoming oil-drilling site. After a geologist and a well-worker die in apparent accidents, she investigates whether the deaths are connected to the field's financial prospects.

Em starts work at an oil company's Denver headquarters and witnesses two apparent suicides from the building. When one death proves to be murder, her questions draw her into corporate deception and complicated personal connections.

Grieving her father and without a job, Em accepts a senator's request to investigate his daughter's murder in Northern California. Infiltrating the victim's environmental services company exposes conflicts over development, water contamination, and political influence.

Em's former boss asks her to investigate his wife's death and help their daughter, who witnessed the murder but remembers nothing. The victim's journals draw Em into family secrets, old relationships, and possible corporate wrongdoing.

Em travels to Utah for a paleontology conference, only to find her host murdered with a dinosaur bone. Rivalries in dinosaur research and secrets within a conservative religious community complicate her search for the killer.

Em joins an FBI agent in Nevada to examine conflicting endangered-species reports involving a proposed gold mine. A dead biologist and missing mining geologist turn the inquiry into a murder investigation with far wider stakes.

An earthquake disrupts Salt Lake City's preparations for the Winter Olympics, and the state geologist is found dead. Em investigates building regulations and corruption, while an unsettling clue points toward her own boyfriend.

When FBI agent Jack vanishes on assignment, Em follows scant clues to Florida and discovers a dust researcher is missing too. Geological evidence draws her into a case linking drug smugglers and threats of terrorism.

Em accepts a job analyzing mineral pigments to determine whether a Remington painting is genuine. Following its history across several states leads beyond forgery to murder, forcing her to solve a case that threatens multiple lives.

A distinctive tattoo helps Em identify a mutilated corpse found at a gravel quarry. The victim's work on water shortages leads her to Colorado, where rival claimants to his ranch and development interests complicate the investigation.

Terrified of water, Em joins her new husband and stepson on a Grand Canyon rafting trip. When a member of their party disappears and a body is found downstream, she must determine whether a murderer is traveling with them.