Ngaio Marsh 
Grave Mistake [EPUB ebook] 

Another classic Ngaio Marsh novel.At first it looked as if Sybil Foster had intentionally left the world: with two husbands dead, a daughter marrying the wrong man and — it later appeared — a debilitating disease, it was no wonder she took her own life.But no one believed she was the type — especially Chief Superintendent Roderick Alleyn. For the field was ripe with unfortunate engagements — one of them a very grave mistake…