One by one : a Danny Ryan mystery
(Book)

Two and a half years after losing his family, Philadelphia journalist Danny Ryan has moved to a new house, started working again, and even began getting close to fellow reporter Alex Burton. Then an old high school acquaintance asks for help. He's been getting threatening text messages. Other members of their high school class have gotten the same messages, and now they're dead. Greg Moss had plenty to hide, but if it was an incident from his youth that led to his death, Danny must put together the lost memories from one fateful high school party all those years ago before he receives a text of his own.