A twisted skein / Sally Goldenbaum.

Enhanced descriptions from Syndetics:

Summer is on the wane in the charmingly picturesque coastal village of Sea Harbor, Massachusetts, but an upcoming fashion show benefit ensures there's still plenty of excitement in store for the Seaside Knitters...

Like every coastal town, Sea Harbor needs tourists and their dollars. But there's something special about that time of year when summer people return to their normal lives, and the wide sandy beaches welcome back locals with their dogs and strollers. And this year, even as the season cools down, Izzy Perry's Sea Harbor Yarn Studio is heating up, thanks to an upcoming fashion benefit . . .

The show will feature hand-knit garments, and enthusiastic knitters flock to the shop for supplies to create runway-worthy pieces. Yet Seaside Knitter Birdie is enjoying flocks of a different kind, thanks to a rekindled interest in birdwatching, a hobby she enjoyed with her late husband. Along with a small group of passionate birders, she often spends weekend mornings looking for warblers, or keeping watch for gannets and grebes. The group members themselves are almost as fascinating as the birds. It's a lovely, special time--until Birdie makes her way through a tangle of vines and stumbles upon a fellow birder's body.

At first, it appears to be an accidental fall, but an autopsy soon reveals that the victim died before hitting a granite boulder. When police discover a clue linking the victim to one of the Seaside Knitters, the web of suspicion grows. Before the woods are ablaze in autumn glory and the knitters have cast off the final rows on their runway projects, they'll have to unravel secrets and ties strong enough to bind friends and neighbors together--and some that may press a killer to take another life.