I See You

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Zoe, a married, Mum of two travels alone on the Tube to work everyday, although she's on a busy commute she can't help but shift that she is being watched, especially after finding a photo of herself in her local gazette for a seedy ad.
The police are involved as women who have also appeared in ads start to be murdered, Zoe begins to feel like she is going crazy and accuses people closest to her. She later realises that she was right to do so, although it isn't until the very end that there is another plot twist and the most unlikely person is the most dangerous person in Zoe's life.

The Family Upstairs

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A wealthy family of 4 have their world turned upside down when another family move in with them, the house is overrun and the male of the other family becomes the man of the house setting harsh house rules in place, nobody is allowed to leave and nobody gets in for years.
Until one night, three of the children agree an escape plan that goes horribly wrong, ending in 3 deaths.

The book switches between different timelines and locations making it a really interesting read that had me gripped from the start.