The Sticky Witch by Hilary McKay
Tom, Ellie and Whiskers the Cat have to go and live with witchy Aunt Tab when their parents set off on a raft around the world. But staying with Aunt Tab turns out to be worse than they first thought - everything in her house is covered with sticky treacle! Can Tom and Ellie escape, or are they stuck? Particularly suitable for struggling, reluctant and dyslexic readers aged 8+