Agatha Raisin: Dishing the Dirt

A therapist had moved into the village of Carsely and Agatha Raisin hates her.
Not only was this therapist, Jill Davent, romancing Agatha's ex-husband, but
she had dug up details of Agatha's slum background.

Added to that, Jill was counselling a woman called Gwen Simple from Winter
Parva and Agatha firmly believed Gwen to have assisted her son in some grisly
murders, although has no proof she had done so.

A resentment is different from a dislike and needs to be shared, so as the
friendship between James and Jill grows stronger, the more Agatha does to try
to find out all she can about her. When Jill is found strangled to death in
her office two days' later, Agatha finds herself under suspicion - and must
fight to clear her name.