The Girl on the Edge of Summer — J.M. Redmann

Micky Knight reluctantly takes on two cases, one for money, one for pity. The first is a trawl though archives to solve a century old murder, for an arrogant grandson who thinks riches should absolve his family of any sins. The other, to answer a mother's anguish as she tries to understand her daughter's suicide. Micky sees no happy ending to either case; the dusty pages of history aren't going to give up their secrets after holding them for so long. And even if she finds answers for the mother's questions, nothing will bring her daughter back. But as Micky discovers, the past is never past and a young girl can lead a complicated, even dangerous, life. The secrets, both past and present, are meant to remain hidden -- only the first murder is hard. The rest come easy.