Sew Easy to Kill — Sarah J. Mason

A STITCH IN CRIME
A blistering heat wave had tempers fraying all over England. Especially at the Allshire Adult Education Scheme's needlework class. Petty squabbles were brewing over available sewing machines. Until one woman wound up dead, electrocuted by a sabotaged foot control. Now Trewley and Stone have to unravel a tangled thread of clues--and find a murderer cut from an entirely different cloth than anyone ever suspected...

MEET TREWLEY AND STONE
Detective Superintendent Trewlev has years of experience probing the Clark secrets of cozy English village life. But even he can use a bit of help sometimes. That's where Stone comes in: with the mind of a scientist and a black belt in judo, she's the perfect partner for tough old Trewley--and together, they're the perfect crime-solving team.