The Family Friend by Claire Douglas

When Imogen is told she’s inherited a country mansion near Bath, she thinks it must be a mistake. She last saw its owner, reclusive artist Dorothea Roe, sixteen years ago: a summer which changed her life for ever.

Once Imogen and her partner Josh settle into the house, she dares to hope that this is the start of a new life.Yet Imogen can’t stop wondering why a woman she barely knew would leave her everything.
And when she discovers a box with her name on it in the artist’s abandoned studio, she’s sure Dorothea was trying to send her a message before she died.

What if her death wasn’t an accident?
Could it be tangled in Imogen’s own dark family history?
And why is she feeling watched all of a sudden?