Isla's mind immediately went to Robert Brune. But Brune was still at large somewhere, and his pattern had never included enclosed spaces or obvious violence. He preferred the open water, the natural drama of the lake itself.
"How long has she been dead?" Isla asked, pushing thoughts of Brune aside to focus on the immediate evidence.
"I'll have a better estimate after the autopsy, but based on rigor and body temperature—" Henley glanced at her notes. "Between six and ten hours. Time of death probably between 9 PM last night and 1 AM this morning."
Isla checked her phone. 6:23 AM. That timeline matched with Rachel's report that her mother had texted around 11 PM about meeting a client. Linda had probably been dead before midnight, her body lying in this cold tunnel while her daughter tried frantically to reach her.
"The burn patterns on Langford," Isla said, moving her flashlight beam across Linda's unmarked face. "You said yesterday they appeared to be contact burns or radiant heat injuries. Deliberate, controlled application of heat."
"That's right."
"But there's no heat down here. These pipes are cold." Isla touched one of the overhead pipes experimentally, feeling the chill of inactive metal beneath her gloved hand. "If our killer used the tunnel system's heat as a weapon against Langford, why would they bring Linda Graves to a section where that weapon doesn't work?"
Henley's expression suggested she'd been wrestling with the same question. "Either we're looking at two different killers, or the same killer adapting their methods based on available resources."
James had been circling the scene, studying it from different angles with the methodical attention of someone who'd processed hundreds of crime scenes as a detective. Now hestopped near the shallow pool of water where Linda had died, crouching down to examine something.
"Isla, look at this."
She joined him, shining her flashlight where he was pointing. The water in the depression was murky and stained, but at the bottom—pressed into the accumulated silt and sediment—was a clear handprint. Palm and fingers, slightly blurred by the water but unmistakable.
"That's where he held her down," James said quietly. "Pushed her face into the water and kept pressure on the back of her head until she stopped struggling."
The image was vivid, horrifying in its simplicity. Linda Graves had been brought to this abandoned tunnel, attacked from behind, then drowned in inches of water while the killer's hand pressed between her shoulder blades, holding her under until her lungs filled and her struggling stopped.
It was intimate violence, personal and direct in a way that David Langford's heat-induced death hadn't been. Yesterday's killer had modified systems, created conditions, then walked away while their victim slowly cooked to death. Today's killer had gotten their hands dirty, had felt Linda's body fight and then go still beneath their touch.
"Two different killers," Isla said, though she didn't quite believe it. "Or one killer with two very different methods."
"The location is the common factor," James said, standing and brushing dirt from his knees. "Both victims died in the steam tunnel system. Both were lured or brought here deliberately. Both deaths required intimate knowledge of this infrastructure—not just the active sections, but the abandoned ones too."
Morrison approached, holding an evidence bag containing Linda's phone. "We pulled this from her purse. Last text message she sent was to her daughter at 10:53 PM: 'Goinginto maintenance tunnels with client. Should be quick. If you don't hear from me in 30 minutes, call police and give them this location: Harbor Drive maintenance complex, steam tunnel access point 4.'"
"Access Point 4," Isla repeated. "But we're at Access Point 11."
"Exactly. So either she got turned around in the tunnels and ended up here by accident, or—"
"Or she was brought here deliberately," James finished. "The killer intercepted her at Access Point 4, then guided her through the tunnel system to this location."
Isla pulled out her phone and opened the schematic Carol Martinez had sent her yesterday—the map showing all seventeen access points and the corridors connecting them. Access Point 4 was on the eastern edge of the network, near the harbor. Access Point 11 was on the western edge, almost a mile away.
"That's a long walk through these tunnels," Isla said, tracing the possible routes with her finger. "Multiple intersections, dozens of places to turn around or realize you're being led somewhere you don't want to go."
"Unless she trusted whoever was guiding her," James said. "If someone presented themselves as a maintenance worker or security personnel, if they seemed official and helpful, she might have followed them thinking she was being escorted to safety."
It fit the profile that was slowly emerging—a killer who understood both the physical infrastructure of the tunnel system and the psychology of their victims. Someone who could present themselves as trustworthy, who could lure people into isolated locations, who could adapt their methods based on what resources were available.
Someone very, very dangerous.
"Dr. Henley, what can you tell me about the head wound?" Isla asked, returning her attention to the body.
Henley gestured for Isla to move closer, then carefully lifted Linda's head to expose the injury. The back of her skull showed a depressed fracture, the surrounding tissue bruised and swollen. "Blunt force impact, probably from a pipe or similar metal object. Struck with considerable force—enough to fracture the skull and likely cause immediate loss of consciousness or severe disorientation."
"Defensive wounds?"
"None on her hands or arms. She didn't have time to fight back or protect herself. The attack came from behind, sudden and unexpected."
Isla thought about Linda Graves's purse, about the pepper spray that had never been deployed. A social worker experienced enough to carry protective equipment, cautious enough to text her daughter with location updates, but still caught completely off guard by an attack in these tunnels.
