The Witch's Daughter

I only have a couple more pages to go on The Witch's Daughter by Nina Bawden. It is a creepy story about a girl called Perdita who doesn't have any friends she doesn't even go to school. People say she's a witch's daughter. Suddenly strangers start arriving on the island first Mr. Jones then Tim and his blind sister Janey. When that happens Perdita is in a centre of great adventure.