The Lavender Ladies Detective Agency #3: The End of Sunset Grove

Third in the Sunset Grove trilogy, by Minna Lindgren, Finland.
Irma and Siri return to Sunset Grove only to discover things have changed in their absence - and not for the better. New management promises spiritual enlightenment in return for donations from its residents. And all of the staff seem to have disappeared, replaced by so-called 'smart' technology that remotely takes care of all of their needs. If only it worked! Irma and Siri are increasingly suspicious of the new order, and plan an elaborate act of sabotage. But their last hurrah has some drastic consequences - will they get more than they bargained for?
Paperback, 339pp. 2015