So, can anyone help me ...
A book I read as a young teen pinched from my grandparent's bookshelf and so probably not appropriate and a bit trashy. Set in London, probably the east end over a long time period in first half of 20th century. Lots of families in different houses on a terraced street. Strange identical twins living in one of the houses. Sinister behaviour. Called Peter and Paul I think. And that's all I can remember.