Oliver and Troll run a cafe for trolls, who are very partial to cake. Their adventure begins when Dolly, Oliver's sister goes missing. It is feared that she may have wandered into danger. Fearless Oliver and reluctant Troll search for Grumbug, a hugeTroll who lives up a mountain and is considered to be the threat. There are many laughs as the pair find that everything that is said about Grumbug is true. As the twosome locate Daisy relief turns to horror as Grumbug appears from behind the mountain. Having escaped the clutches of Grumbug with a speedy descent, Oliver puts his mind to cheering up Grumbug. The lively and colourful illustrations work well with the text. There are rhyming moments, alliteration and opportunities to explore the tr blend in what is a fun story with a twist.