Baby Aliens Got My Teacher

One day Izzy and her friends are surprised to find that their teacher, Miss Jones, is actually being nice to them. This is the woman who was caught secretly smiling when Maisie Miller fell off her chair. There can only be one conclusion: she's been taken over by aliens, and now she wants to make them all aliens too!
From the book: One time I found a crisp shaped EXACTLY like Mrs Cunningham who lives upstairs and when I showed Mum she just said, 'No thanks, you eat it.' I obviously did NOT eat it, I put it in an envelope and carefully posted it through Mrs Cunningham's letter box. Because that's what I would want someone to do if they found a crisp shaped exactly like me (also called a crisp twin).
'Enjoyable for its childlike sense of adventure, humour and imagination.' - The Sunday Times
'…full of fun. The bold, bright package is particularly enticing, making this a book that children will want to pick up. With quirky characters, laugh-out-loud humour and a reassuringly familiar primary school setting, it will particularly appeal to young readers with lively imaginations.' - BookTrust