It’s just a little key. Somebody sent it in the mail. But the person it was sent to never got it – and nobody knows who sent it. So now it's in the Dead Letter Office at the city post office.When Danny hears about it, he decides to solve the "BIG mystery of the LITTLE key. "Danny and his friend Emma search for answers all over town.Who sent the key? Who was it for? And, most importantly, what does it open?

Special Features: Robin Readers is an exciting series of original fiction for learners of English. Designed to be read for enjoyment, the stories are accessible and engaging, with carefully graded language.

Each reader comes with comprehension and vocabulary activities to consolidate understanding. More difficult or uncommon words appear in a glossary.

There is a stimulating variety of settings and storylines across a range of genres, including travel adventures, fantasies, science fiction and thrillers.