Mrs Maginnes is Dead by Maeve Sleibhin

Arriving at her rented accommodation in Edinburgh, music student Socorro de las Torres finds herself sucked into the exhilarating, madcap world of her new neighbours: the five Aspenall sisters. From them she learns that her landlady, Mrs Maginnes, is dead—pushed off a cliff—and that the sisters are the prime suspects. Of more concern, however, are the contents of the old lady’s will: one million pounds-worth of Byzantine gold coins left to whoever finds them first. The search is hampered not only by the whole town searching for the gold as well, but also by Mrs Maginnes’s other bequest: a troublesome, Welsh goat with a penchant for escape and Marks and Spencer’s sandwiches.