Why Lalie Walker is taken to court?

It’s a highly unusual legal situation where the author of a piece of fiction is taken to court because the action takes place in a particular locality, and the owners of that locality feel their name has been dragged through the mud. Yet that’s what’s happened in the case of Lalie Walker’s book, Aux Malheurs des Dames.
    The Marche Saint-Pierre, where the murder story unfolds, is a well-known fabric store near Montmartre. In the book, staff members go missing as voodoo dolls are pinned to the walls and rumours swirl around the behavior of the shop’s managers.
    In their plea, the real-life owners of the Marche Saint-Pierre say it’s a registered trade mark and that no one can write about it without prior permission. (30)They say their image has been seriously harmed by the book, and they want damages of two million Euros—more than two and a half million dollars.