Add a new book to existing series

[Nita]

Can you please add A Touch of Purple to the Towers of the earth series.

Thank you.

Can the prequels be added to the series as well?

[Liralen]

Done: https://www.goodreads.com/series/2325...

We can add prequels, but we need to know what they are in order to add them - please link to any other books that need to be added. (Note that A Pinch of Salt and A Hint of Hope are already on the series page.)