« Murder on a Midsummer Night » Kerry Greenwood

I never met such vile people…. The Hon. Phryne Fisher, languid and slightly bored at the start of 1929, is engaged to find out if the antique–shop son of a Pre–Raphaelite model has died by homicide or suicide. He has some strange friends — a Balkan adventuress, a dilettante with a penchant for antiquities, a Classics professor, a medium and a mysterious supplier who arries after dark on a motorbike. At the same time she is asked to discover the fate of the lost illegitimate child of a rich old lady, to the evident dislike of the remaining relatives. With the help of her sister Beth, the cab drivers Bert and Cec and even her two adoptive daughters, Phryne follows eerie leads which take her into odd territory, including the conquest of Jerusalem by General Allenby and the Australian Light Horse, kif smokers, spirit guides, pirate treasure maps and ghosts