Thunderbolts is a series of levelled reading books covering popular non-fiction topics, with particular appeal to older readers. Each book contains a non-fiction section followed by a fiction story on the same topic. There are four sets in the series. Each set contains six books and is levelled to allow progression. Set Two introduces a very limited number of words on each page. The texts focus on high frequency vocabulary, with all words being phonically decodable wherever possible. Set 2 Workbook 1 accompanies Menacing Monsters, Shop Till You Drop and Space Ships. It contains tasks to allow a degree of progression as they are used. Thunderbolts is ideal for reluctant readers aged 7 - 14 with a reading ages of 5 - 7.