Movie in which a husband and wife move to a house in the country. The wife thinks she’s going crazy (?). It turns out the husband has been drugging her, she dies when she goes horseback riding and falls off (?). We find out that the husband has been having an affair with the woman who he met at the museum at the beginning of the film. After his wife dies, he ends up killing the other woman and the final scene is her body floating in the indoor swimming pool as he sits at the side.