This one comes heartily recommended.
My thanks to the good people at Bloomsbury for sending the book. We also have a review of [[The Broken King by Philip Womack]].
If they like the look of ''The Liberators'', I think they might also enjoy [[The Alchemyst by Michael Scott]], which taps very heavily into classical mythology and features some charismatic twins, or [[Verdigris Deep by Frances Hardinge]], which loves language and has three very disparate but very interesting central characters.