Star Wars Imperial Commando 501st, Paperback by Traviss, Karen, ISBN 0345511131, ISBN-13 9780345511133, Like New Used, Free shipping in the US

After the Republic falls and a black ops unit within Vader's own 501st Legion emerges, tasked to hunt down fugitive Jedi and clone deserters, old feuds must be set aside to unite against a far bigger threat in a savage new galactic order. Original.