Sea Harbor is a sleepy fishing village located on the coast of Massachusetts. Like every Thursday, Nell, Birdie and Cass get together to knit in the Seaside Knitting Studio run by Izzy Chambers, but that day the noises coming from upstairs do not let them concentrate on the work. The next day, the lifeless body of Angie, the neighbor, is found trapped in a lobster trap. The news shocks the group of weavers so much that they are entangled in an investigation to unravel the truth and put an end to the mystery.