SOLVED. Mystery novel with "Siege" in title about an English family on holiday in France. [s]

[David]

This is a mystery or thriller novel. It has the word "Siege" in the title. I have forgotten the author's name.

Plot: An English family are on holiday in a French village. The place in which they are staying is besieged. There is a character called "Step".

The novel was published between 1980 and 1999.

[Mai]

I think I found it:
Siege by Domini Taylor (a.k.a. Roger Longrigg, or at least on Amazon the author is listed as Roger Longrigg and it says "writing as Domini Taylor").
The Kemp family have a motley collection of interests and personal difficulties. They rent a fortified farmhouse for the summer, so that Giles can dabble in watercolours; Rob can recover from a breakdown; and Step can indulge her obsession for the Cathars, whilst the children can roam free. However, hostile villagers and a near fatal accident threaten to stretch family relationships to breaking point. They trigger a series of events, with secrets held by the farmhouse playing a part, that lead to death, devastation and terror …

[David]

Thank you, Mai. That's the one!