THREE CAN KEEP A SECRET by Judy Clemens

Dairy farmer and biker Stella Crown is exhausted running her farm by herself, after the death of her long time farm hand. When Lucy Lapp, a young Mennonite widow with a daughter, applies for the job, Stella is relieved. She checks Lucy's references, and has a good feeling about her. She certainly knows her way about a dairy barn.

But Stella's house is vandalized with graffiti directed against Lucy, and there are anonymous calls hinting about suspicious circumstances around her husband's death. Plenty of suspicious characters and pinger pointing to go around. The second book in this series does not disappoint.