Mara Stone is a developer inside Lexomire Systems who understands something the company refuses to admit: emotional instability is not random. It follows patterns. It escalates predictably. And when it reaches collapse, intervention is already too late.So Mara builds her own solution. Evalis Core.Evalis Core is a neural implant designed to monitor emotional variance in real time, classify threat levels, and authorize intervention without hesitation. No committees. No oversight. No disclosure. Lexomire does not know the system exists, and no one else has access to it.THE THREAT INDEX is a psychological corporate thriller about control, rationalized violence, and the cost of treating human emotion as a correctable defect, following a woman who builds a system to prevent collapse and realizes too late that it does not require her consent to decide who remains operational.