Murder in the Margins by Margaret Loudon

The plot thickens for American gothic writer Penelope Parish when a murder near her quaint British bookshop reveals a novel's worth of killer characters.
Penelope Parish has hit a streak of bad luck, including a severe case of writer's block that is threatening her sophomore book. Hoping a writer in residence position at The Open Book bookstore in Upper Chumley-on-Stoke, England, will shake the cobwebs loose, Pen, as she's affectionately known, packs her typewriter and heads across the pond.
Unfortunately, life in Chumley is far from quiet and when the chairwoman of the local Worthington Fest is found dead, fingers are pointed at Charlotte Davenport, an American romance novelist and the future Duchess of Worthington. Charlotte turns to the one person who might be her ally for help: fellow American Pen. Teaming up with bookstore owner Mabel Morris and her new friend Figgy, Pen sets out to learn the truth and find the tricks that will help her finish her novel.

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