Toaru Mikaiketsu Jiken ni Tsuite

Reporter Rei Kurisu, eight years into this career without a single scoop to show for it, was starting to sweat a bit. So, when a tip comes in that the home where the famously unsolved K City Family Murder took place is soon to be torn down, Rei immediately sets out to investigate. But this house may hold more secrets than ever expected. It starts with a single peculiar photograph, and the further Rei probes, the more hidden truths and pieces of the victims' shocking past come to light.

Source: MangaPlaza
https://www.cmoa.jp/title/343253