Stillhouse Lake (Stillhouse Lake #1) by Rachel Caine

After a freak car accident revealed that her husband is a serial killer, Gina Royal has done everything she can to keep herself and her kids safe from the harassment of Internet trolls that thinks that she was an accomplice. She's uprooted her kids many times at a seconds notice when threats get too close, but now, as Gwen Proctor, she is ready to settle down near the peaceful Stillhouse Lake, until bodies begin showing up in the lake.