In the shadow of Long Island's serene coastline, a decades-long nightmare is unearthed with the discovery of multiple sets of remains near Gilgo Beach. This chilling documentary series delves into the complex investigation that finally zeroes in on a suspect, architect Rex Heuermann, and the profound shockwaves that ripple through his own family. Through exclusive interviews with his wife, Asa Ellerup, and daughter, Victoria Heuermann, alongside law enforcement officials like Suffolk County Sheriff Errol Toulon and detectives Kevin Sheehan and Christopher Sheridan, the series explores the harrowing duality of a man accused of monstrous crimes while maintaining a seemingly ordinary domestic life. Journalists including Selim Algar and Jorge Fitzgibbon piece together the public narrative, as the personal stories of those closest to the case reveal a haunting portrait of betrayal, survival, and the search for truth. "The Gilgo Beach Killer: House of Secrets" constructs a tense, atmospheric true-crime narrative, examining not just the hunt for a killer, but the devastating collateral damage left inside the very walls he called home.