The Margin Before Dark

When Larkspur City stops cooling after dark, the danger is not a single dramatic failure. It is everything that becomes harder when the heat accumulates.Adrian Kell has been brought in by Morrowline Response to map the consequences that official critical-load lists cannot fully see: older apartment towers, medically vulnerable residents, cooling sites, telecom dependencies, water systems, and the ordinary blocks where a controlled power interruption could become a human emergency.Dr. Celia Ward is responsible for regional grid reliability. She cannot protect every load, and she cannot make capacity appear because the consequences are painful. As temperatures rise and electrical options narrow, Adrian and Celia are forced into the same impossible question from opposite sides: what does a responsible decision look like when every technically valid choice still costs someone?Over three punishing days, professional respect becomes something more dangerous-and more necessary. But trust is tested when the system must act before the human picture is complete.The Margin Before Dark is a grounded romantic-suspense novel about extreme heat, electric-grid pressure, mature professionals, and the narrow space between knowing the risk and having the power to prevent it.