Manna from Hades

Eleanor Trewynn is a widow of some years living in Port Mabyn, a small fishing village in Cornwall, England. In her younger days, she traveled the exotic parts of the world with her husband. These days, she's retired and volunteers at a local charity shop. Her niece, Megan Pencarrow, has recently transferred nearby, as well as recently promoted to the rank of Detective Sargent. Perhaps the only downside is that she is now working for a DCI who doesn't approve of women on the police...
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Eleanor Trewynn is a widow of some years living in Port Mabyn, a small fishing village in Cornwall, England. In her younger days, she traveled the exotic parts of the world with her husband. These days, she's retired and volunteers at a local charity shop. Her niece, Megan Pencarrow, has recently transferred nearby, as well as recently promoted to the rank of Detective Sargent. Perhaps the only downside is that she is now working for a DCI who doesn't approve of women on the police force and really doesn't approve of Megan's aunt Eleanor, as she has been a common thorn in his rather substantial side. All of these factors collide when, the day after collecting donations, Eleanor and the vicar's wife find the dead body of a long-haired, scruffy-looking youth hidden in the stockroom of the charity shop. Then they discover that some donated jewelry is actually real (not paste), very expensive, and the haul from a violent robbery in London. Making matters more complex, the corpse found in the storeroom is apparently not one of the robbers. Manna from Hades is a confounding case of daring theft, double-cross, and a wily older woman confronted by a case of murder most foul.