Under the glare of the region's perpetual daylight, Dormer and Hap close in on the primary suspect, reclusive novelist Walter Finch. During a tense stakeout on a rocky, fog-shrouded beach, Finch slips into the mist and out of Dormer's grasp. As he makes his escape, shots ring out…and Hap is killed.
As he struggles to cope with his sense of responsibility and remorse over his partner's death, Dormer is forced into a psychological game of cat-and-mouse by the brilliantly malevolent Finch. The stakes escalate as Dormer contends with an unproven but perceptive local cop and becomes increasingly entangled in Finch's web of manipulation.
Unable to find respite from the relentless Midnight Sun or his own distorted judgment, the dangerously sleep-deprived detective finds his stability gravely threatened.