Huge congratulations to the first two adults to solve it, both UK adults: one anonymous person first and, shortly after, Rachel Jackson! Hundreds of visitors tried but until the hints were published, no one solved this code. Can you?

XBDZGPRIQGSMQPGAZZ

LILXOXHMGFKQPGSMQPGAZZ

LMPRKMUQGUQRLQOPDZGFRIQ

JAEXLZOQDPWTHYXBDZGPRIQ

Hints

1. The lines rhyme
2. It’s a quotation from a summer play
3. Two Caesar codes alternate ABABAB etc
4. Code A starts each line

Solution 

If you enjoyed this code, there are several equally complex codes in The Einstein Code by J D Welch for Ben, Jess and Freddie (or you) to solve in their increasingly dangerous quest to rescue Ben’s mum.