When Walter Miller fell into the swimming pool, his face a contorted mask, Ines was convinced that she had poisoned him with a love potion. However, Dr Llabares recognised that Mr Miller was suffering from datura poisoning, and was able to treat him in time to save his life. Inspector Alvarez is not surprised when Ines subsequently denies poisoning her lover; but he was not expecting Miller to agree that there was no possibility that she could have done so. In the face of these denials, the investigation is at an end. Until two months later when Miller flies home to England to stay with his wife, but never arrives . . .