The Girl from Devil's Lake – Chapter 31 Summary & Analysis

⚠️ Spoiler Warning: This guide contains detailed spoilers for the entire novel. Proceed only if you've finished reading or are comfortable knowing the plot.

Summary

Anna Rae Green calls Sheriff Joanna Brady with two new possible victims tied to the same pattern: Inez Johnson (disappeared in 1972 near Bylas, Arizona) and Michael Young (disappeared in 1977 near Shiprock, New Mexico). Both died by manual strangulation, showed no signs of sexual assault, were found in water, and had a personal item missing—matching the conditions of Amanda Hudson and Xavier Delgado. Joanna realizes that suspect Roper traveled summers and likely kept trophies. She proposes a nationwide BOLO for similar unsolved cases rather than for the suspect. Anna Rae agrees to use her FBI connections via the Secretary of the Interior to circulate the request. Later, Arturo reports that the “Señor Santa Claus” uses a blue bag for distributing sack lunches; this bag may match the one used to hold Xavier Delgado’s body. Joanna feels there is still insufficient evidence for a search warrant, but Arturo will keep Roper under surveillance. At home, Joanna downplays the developments to her family.

Key Events

Two new cold cases surface: Inez Johnson (1972) and Michael Young (1977) present the same hallmarks: manual strangulation, no sexual assault, body in water, missing trophy item.
Joanna connects the dates to Roper’s travel schedule: Summer trips coincide with the victims’ disappearances; Roper would have needed to return to Bisbee by September for school.
“BOLO for victims” strategy is born: Instead of asking law enforcement to look for a suspect, Joanna wants agencies to search their unsolved files for cases matching the common denominators.
FBI involvement is secured: Anna Rae will have the Secretary of the Interior direct the FBI to forward any relevant hits directly to Joanna.
Blue bag detail emerges: Arturo learns that “Señor Santa Claus” uses a blue bag; this could be the same dye lot as the bag that held Xavier Delgado, potentially linking the suspect to the murder.
Surveillance plan: Joanna and Arturo agree that evidence is still too thin for a warrant, so they will keep Roper under watch.
Joanna masks the stress from her family: At dinner, she tells Butch and the kids the work is “no biggie,” though she knows the case will soon become public.

Character Development

Sheriff Joanna Brady demonstrates strategic thinking by shifting from looking for a suspect to looking for victims. She also shows restraint by acknowledging the limits of her evidence and by protecting her family from case details until they become unavoidable. Her internal conflict between professional urgency and home life is clear when she dismisses the matter as “just work.”
Anna Rae Green proves to be an effective ally. She not only identifies the two new cases but quickly grasps the potential of the victim-focused BOLO. Her willingness to leverage her boss’s position at the Department of the Interior highlights her resourcefulness and loyalty to Joanna.
Arturo (presumably a detective or deputy) keeps the investigation grounded by verifying the color of the Santa sack-lunch bag. His readiness to mount surveillance despite the lack of a warrant shows his commitment and tactical judgment.
Roper (the suspect) remains off-stage, but the accumulating circumstantial evidence—the palm print to Amanda Hudson, the travel pattern, the blue bag—heightens the tension around him without yet giving the team probable cause.

Themes, Symbols, or Motifs

Trophy-taking as a signature: The missing items (shoelace, bandanna, squash blossom necklace) are not random; they’re objects the killer keeps. This motif reinforces the idea that violence is ritualized and that the killer derives power from possessing remnants of his victims.
Jurisdictional cooperation vs. limitation: The chapter underscores how small-town sheriffs often lack the reach to solve multi-state cold cases. Joanna can only succeed because Anna Rae can open doors at the federal level. The theme of institutional scale—how far you can reach depending on your position—is central here.
Water as disposal ground: The body of Inez Johnson was found in the San Carlos Reservoir, Michael Young’s in the San Juan River. Water functions both as a literal dumping site and as a symbol of erasure, yet each case leaves enough evidence to be recognized as part of a pattern.
Domestic concealment: Joanna’s decision to hide the case’s gravity from her children (and even from Butch) reflects the theme of compartmentalizing trauma and professional danger to maintain normalcy at home.

Why This Chapter Matters

Chapter 31 is a turning point in the investigation. It expands the suspect’s profile from a local Bisbee case to a multi-state serial killer operating over decades. The “BOLO for victims” idea is an innovative procedural move that could unlock dozens of cold files. The blue bag discovery provides the first concrete physical evidence linking Roper to Xavier Delgado’s murder, moving the case closer to a warrant. Character-wise, it shows Joanna maturing as a sheriff who knows when to lean on federal resources and when to trust her team’s instincts. The chapter also raises the stakes for Joanna personally, as the inevitable media coverage will soon force her to explain to her children why the case is dangerous.

Study Questions & Answers

1. Why does Joanna suggest sending out a BOLO for victims rather than for the suspect?
Joanna realizes that Roper’s victims come from many small jurisdictions, each with an unsolved cold case. By asking agencies to search their files for murders matching the known commonalities (manual strangulation, no sexual assault, body in water, missing trophy), they can uncover additional cases without needing to describe the suspect, about whom they have no reliable physical description or name. This approach uses the pattern as a signature to find Roper through his victims.

2. What does the blue bag signify, and why is it important that “Señor Santa Claus” uses one?
The blue bag is the same type—and possibly the same dye lot and item number—as the bag in which Xavier Delgado’s body was found. If the bag used by the Santa sack-lunch distributor matches the murder scene bag, it provides a direct link between Roper (who plays the Santa role) and the homicide. This physical evidence is crucial because without it, the case relies only on a palm print to Amanda Hudson and circumstantial timing.

3. How does Joanna’s interaction with Butch at the end of the chapter reveal her state of mind?
When Butch gives her a questioning look, she says “Just work. No biggie.” This dismissal shows Joanna is consciously protecting her family from the danger and emotional weight of the investigation. She knows the case will soon explode on Marliss’s website, and she is bracing for that moment. The line also betrays a minor deception: it is a very biggie, but she needs to maintain calm for her children’s sake.