The third Inspector Thanet omnibus - Dorothy Simpson

Comprising ELEMENT OF DOUBT, SUSPICIOUS DEATH and DEAD BY MORNING, this is the third omnibus edition of the Inspector Thanet series.
ELEMENT OF DOUBT - Nerine Tarrant had everything a woman could wish for: beauty, health, a famous surgeon for a husband, a handsome intelligent son, every luxury money could buy... So why was her body found on the terrace of her elegant country estate?
SUSPICIOUS DEATH - Inspector Thanet is called in to investigate the murder of Marcia Salden, mistress of Telford Green Manor. He discovers that if Mrs Salden hadn't managed to get herself murdered, it wasn't for want of trying.
DEAD BY MORNING - Leo Martindale is apparently the victim of a hit-and-run accident. After an absence - and a silence - of 25 years he had returned to Kent to claim his vast inheritance. Was his death an accident? Or was it murder?