[sufue]

Not My Blood is the tenth in the excellent (IMO) Joe Sandilands series by Barbara Cleverly. It has recently dropped to $1.99 at Kindle US.
link: http://www.amazon.com/Not-Blood-Sand...dp/B007DY5SX0/

Spoiler:

Scotland Yard Detective Joe Sandilands is caught off guard one night in 1933 by a phone call from a distressed boy named Jackie Drummond, who just might be the illegitimate son Joe never knew he had. Jackie is in trouble at his Sussex boarding school, where a teacher has been murdered. When Joe gets himself assigned to the investigation, he learns the boarding school case is more complicated than it appears: A frightening number of boys, all from wealthy families, have gone missing over the school’s history, and by some coincidence none of the families have followed up on their sons' whereabouts.

While I was looking at Cleverly's books, I also noticed that two other titles in the Sandilands series are only $2.99, which is a very reasonable price for backlist titles IMO. They appear to be long-term priced at $2.99, not any special sale, but since I'm listing Not My Blood, I thought I'd mention these two also.

The Palace Tiger is the fourth in the series.
link: http://www.amazon.com/Palace-Tiger-J...dp/B00OGUX00M/

Spoiler:

India, 1922. In this, the fourth in the acclaimed Joe Sandilands series, Scotland Yard detective Joe arrives in the princely state of Ranipur at the request of the Maharajah, an old ally of the British. The Maharajah is dying, and the succession is unclear. The death of his first son, while panther-wrestling, is suspicious, but as Joe begins to investigate a second son dies dramatically right before his eyes. With only the youngest, aged 12, now left to succeed, can Joe ensure his survival? In the glittering and luxurious setting of the court with its array of powerful, scheming characters, Joe must find his way through the maze of intrigue to trap, at last, the palace tiger.

The Bee's Kiss is the fifth in the series.
link: http://www.amazon.com/Bees-Kiss-Joe-...dp/B00OGUX5MU/

Spoiler:

1926, and Joe Sandilands is back from India, enjoying the frantic pleasures of Jazz Age London. Yet, there is a darkness behind all that postwar gaiety. A woman has been discovered bludgeoned to death in her suite at the Ritz. A broken window and missing emerald necklace suggest that it is a burglary gone wrong. But the corpse is that of a much-respected member of the British establishment, Dame Beatrice Joliffe, one of the founders of the Wrens, and so Scotland Yard send Joe to conduct a swift enquiry. Her companion, an ex-chorus girl, falls from Waterloo Bridge at twilight.

Two of the Dame's clique of eager young Wrens commit suicide. All these deaths make Joe suspect that Beatrice has been killed by someone close to her but suddenly he finds that the case is closed and he is asked by his superiors to surrender his files. Against the background of the looming General Strike, and pressure from unseen governmental presences he struggles on, picking his way through the political panic and rebelling against authority, through to a shattering solution to the killings.