I Know What I Saw by Kathryn Croft

YOU WITNESSED A MURDER.
NO ONE BELIEVES YOU.

When Ria moves with her husband to Silverleaf Heights, she hopes to recover from the incident that nearly took her life. Everything seems perfect – the houses are beautiful, the neighbours welcoming and the locked gate keeps the danger out.
Or does it?
Late one night, Ria sees a woman being attacked. When she raises the alarm, there’s no evidence. No crime. No victim. But Ria knows what she saw – and she won’t let it go.
Then an anonymous text appears on her phone, a video of another woman being murdered. Looking closer, Ria realises the woman is her. The message vanishes without a trace, but its meaning is clear: stop searching for the dead woman, or you’ll be next.-