Coram House by Bailey Seybolt

On a blistering summer day in 1968, nine-year-old Tommy vanishes without a trace from Coram House, an orphanage on the shores of Lake Champlain. Some say a nun drowned him, others say he ran away. Or maybe he never existed. Fifty years later, his disappearance is still unsolved.

Struggling true crime writer Alex Kelley needs a fresh start. When she’s asked to ghostwrite a book about the orphanage—and the abuses that occurred there—she packs up her belongings and moves to wintry Burlington, Vermont.
As Alex tries to untangle the conflicting stories surrounding Tommy’s disappearance, her investigation takes a chilling turn when she discovers a woman’s body in the lake. Alex is convinced the death is connected to Coram House’s dark past, even if local police officer Russell Parker thinks she’s just desperate for a career-saving story. As the body count rises, Alex must prove that the key to finding the killer lies in Tommy’s murder, or risk becoming the next victim.