Amateur sleuth Astrid Swift swaps the sporting summer in England for a British expat enclave in Spain, where everyone has a mysterious reason for leaving the UK.
Amidst the sun and sangria, something sinister is lurking on the Spanish coast...
It's the end of the summer season in the harbour town of Estepona. The holidaymakers are heading home, leaving the British expats to reclaim their little corner of paradise. Art restorer Astrid Swift has sailed into town to reunite with her estranged father, but has instead been tasked with catching an internet troll who's been threatening his wife.
Soon Astrid is entwined in the lives of all the expats, from the boozy local heckler to the socially awkward beachcomber.
And then she discovers a body in the bunker of the golf course...
Can Astrid uncover the 'Costa del Troll' behind the poison-pen campaign before they reveal everyone's secret past? Or will they tear this cosy community including Astrid and her father even further apart?