"The Gilgo Beach Killer: House of Secrets" investigates the life of the alleged murderer, providing a close-up view of his home and the unsettling discoveries that surfaced after his arrest. Family members recount their experiences, revealing a man who maintained a sinister double life. The documentary explores the intricate dynamics of family relationships and the dark secrets hidden within the household. As the narrative unfolds, it confronts the complexities of innocence and guilt in a community reeling from tragedy, leaving viewers to grapple with the shocking truths that can lie just beneath the surface.