When EMT Callie Rhodes pockets a black thumb drive handed to her by a dying man, she expects paperwork and an unanswered question. What she finds instead are stitched-together surveillance clips, a woman who moves like Callie and yet is not, and a quiet machinery that edits memory and erases names. Someone is watching the edges of her life-and they are careful, practiced, and willing to remove anything that gets too close.A pulse-quickening thriller about identity, memory, and the cost of seeing what others hide.Callie is a working responder with a steady hand and a stubborn sense of duty; when a dead man passes her a drive, she chooses to look. That choice pulls open a city's secret net of footage, false flags, and disappearances.The footage shows a woman who knows Callie's face, then refuses to be captured cleanly. Childhood reflections in a kitchen mirror and clips time-stamped for days yet to come force Callie to ask: is this a twin, a frame, or a frame-up?Allies and dangers blur: Detective Morano's questions arrive with polite pressure, Ben hacks at the edges of the net, and Ellis the archivist keeps film that remembers what people want to forget.Tight, atmospheric scenes-hotel chaos, rain-slicked streets, a break-in that smells of hospital antiseptic-build to a conspiracy that treats identity like evidence you can refile.For readers who love lean, cinematic suspense with a strong, fiercely human heroine and surprises that land like a slap-The Second Witness is a dark, propulsive novel about how a single image can unmake a life.