Seaglass

Lark struggles when her family and their friends go on holiday in a lonely caravan site on the Welsh coast. Her mother is ill, her little sister has stopped speaking and she has fallen out with her best friend. Is a girl in a green dress following her in the fog? Or is her sister playing tricks on her? When a local woman tells her the girl comes to take sisters, Lark finds herself the only one who can save her family.