Penny Batchelor is a thriller writer whose first novel My Perfect Sister was nominated for the Guardian "Not The Booker Prize" 2020. We discuss her latest novel Her New Best Friend, about an isolated mother of two young children whose new friend may not be all she seems. We talk about including disabled people in fiction, taking the plunge to write that first novel after turning 40, exploring female friendships on the page and jumping around genres. Penny is also the co-founder of Thriller Women with EC Scullion, where they share interviews with female thriller writers.