Fallacy (2004)

Comedy drama about an overseas trade fair for a building components company (doors and louvres to be precise), company boss John Garrard is too caught up in trying to make a success of his business to realise that his long time secretary Mrs Rogers is carrying a major torch for him, once it is pointed out to him by a colleague he sets out to seduce her but a series suspected heart attack) conspires against it.

Thriller, Mystery