The Considine Curse by Gareth P. Jones
Mariel returns to England for her grandmother's funeral. It is the first time she has been back since she emigrated with her mother as a baby, and it is the beginning of the uncovering of some really extraordinary truths about the Considine family. Why did Mariel's mum argue with Grandma all those years ago? Why does Amelia wear so much perfume? Why is there a very large cat flap in Louvre House? Why does Gerald seem scared of his brother's appetite? Did Grandma Considine really break her neck falling down the stairs? And most importantly, what is the dark secret that lies at the heart of the family?