Murder at the marina - Janet Finsilver

She's got to solve this--or her friends are sunk . . .

Kelly Jackson, manager of the Redwood Cove Bed and Breakfast, is fond of the Doblinsky brothers, Ivan and Rudy, members of the Silver Sentinels, a crew of crime-solving senior citizens in their Northern California seaside hamlet. After she discovers a jewel-encrusted dagger--with what appears to be dried blood on the blade--on their fishing boat, they share their family history with Kelly, and she learns that the knife may be part of a set from their long-ago childhood in Russia. Its sudden reappearance is eerie, but the mystery grows much more serious when a body is found on the boat. The victim was a member of the community and part of the Russian Heritage Festival, and some of the organizers were clearly harboring some bitterness. But the story behind this murder seems as layered as a nesting doll--and Kelly's feeling completely at sea . . .