Methodical, brilliant, and emotionally guarded, ATF chemist Dr. Cassian Holt trusts only the evidence. When a serial arsonist targets a small town's queer community, he's tasked with profiling a killer who builds monuments of flame. His partner is K9 handler Jonah Briggs, a man of quiet instinct who sees the human cost behind Cassian's cold data.

They are oil and water forced to work as one. But as the killer's motive twists into a fanatical crusade, they are lured into a burning sawmill—a final, explosive trap. To survive, they must fight their way out from within the inferno, relying only on the trust they've barely begun to build. Can the spark between them light the way, or will they become the final sacrifice?