The Skylight by Louise Candlish

Simone has a secret. She likes to stand at her bathroom window and spy on the couple downstairs through their kitchen skylight. She knows what they eat for breakfast and who they’ve got over for dinner. She knows what mood they’re in before they even step out the door. There’s nothing wrong with looking, is there?

Until one day Simone sees something through the skylight she is not expecting. Something that upsets her so much she begins to plot a terrible crime…