The Treeline: Pacific Northwest K-9 Mysteries, Book 8 book cover

About The Treeline: Pacific Northwest K-9 Mysteries, Book 8

For nearly four years, Kate Soren has watched the Olympic Mountains from the harbor road and never gone up. This is the case that takes her to the treeline. An experienced mountaineer named Keld Sather has vanished above eight thousand feet.

The terrain is the alpine Kate trained for in Colorado, on Pacific Northwest weather she has never worked. Snow cover that traps and releases scent unpredictably. Wind shifts every few minutes.

Altitude that thins the air and changes both handler and dog. Conditions Scout has never encountered. And, somewhere on the mountain, an evidence cache Keld left in a cairn at five thousand two hundred feet, with a note: If you find this, the man you want is Prescott.

The man Kate has been writing in her field log for nearly four years. The man whose name has surfaced in case after case, permit after permit, since her second autumn on the Peninsula. The fixer behind the corruption thread that runs through every Arc One book.

Wade Prescott. This is the case that connects them all. This is the case where Kate finally puts a face to the name.

This is Arc One’s finale. THE TREELINE is the eighth and final book in Arc One of Sophie Lyon’s Pacific Northwest K-9 Mysteries, the alpine procedural where four years of slow-burn corruption arc finally surface and the woman who has been quietly assembling the case across eight environments brings the pattern home. For fans of Margaret Mizushima’s Timber Creek finale, Paula Munier, and Sara Driscoll.

What readers will find:The Arc One climax, every thread from Books 1–7 connects hereAn alpine procedural with full Olympic Mountains authenticityA moral handler error where both outcomes are acceptable but the protagonist carries weightAn evidence cache hidden at five thousand two hundred feetThe cozy contract holds, no graphic on-page violence, the dog comes homeA dock-scene finale that closes Arc One and earns the eight-book climbArc Two coming, The Iron Shore continues the seriesIf you’ve been with Kate and Scout from THE DEEP GREEN, this is the book Arc One has been earning.

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