A Small Hill to Die On by Elizabeth J. Duncan

Penny and her friend Victoria, worry about a new nail and tanning salon opening up in their Welsh village and taking business away from their own Llanelen Spa.  Mai Grimstead, the owner of Nailz, has just moved to town with her husband and two teenage children into Ty Brith Hall, a beautiful old property. When Penny discovers Mai's daughter Ashlee murdered near a waterfall, she is stunned.  She's warned not to do any investigating of her own by her boyfriend, DCI Gareth Davies, but Penny ignores him, unwittingly putting herself in danger.  A Small Hill to Die On is the fourth book in the Penny Brannigan series.  Perfect for readers who enjoy the Lois Meade series by Ann Purser and other British cozy mysteries.