Misery Hates Company - Elizabeth Hobbs

A young woman is invited to a mysterious relative's estate and winds up entangled in a murder investigation in this witty historical mystery that pits the gothic eeriness of Crimson Peak against the comic absurdities of Knives Out.
Miss Marigold Manners may be steeped in the etiquette of her old-money Boston family, but she is also an accomplished, modern woman and an avid student of archaeology who can handle any situation with poise. When the death of her parents leaves her too destitute to pursue her academic career and she receives a letter from a distant relative on Great Misery Island, Marigold decides she must do what any person of superior sense and greater-than-average curiosity would: she mounts her trusty bicycle and heads up the craggy, fog-shrouded coast of New England for a date with fate.
Marigold arrives at Hatchet Farm, a moldering, gothic pile of a house inhabited by relatives so mired in the sins of the past, they have no future....