An Air of Murder — Roderic Jeffries

Stayforth House in England had been inherited by the oldest son, Jerome, but he had allowed his younger brother, Charles, to live in his caseta in Mallorca. When Jerome died however, his wife, Heloise, was less generous. When Dora Coates visits the caseta in search of Heloise and is drowned in the bay, Inspector Alvarez must persuade his chief not to jump to conclusions too hastily.