Revenants

Several months after Chewbacca's death, Han Solo has been convinced by his wife and Lando Calrissian to stop moping and go on a reconnaissance mission on the other side of the galaxy from Vector Prime.

Near Raxus Prime, Han's shuttle encounters the Slave I and is shot down onto the junkyard moon. Keeping a log on his datapad for Leia, Han spends the next few weeks trekking across the moon, making makeshift weapons and survival gear to avoid Boba Fett, who is hunting him.

Han finally comes to the realization that there is more than one Fett following him. When that happens, he comes face to face with the real Fett. Fett reveals to Han that the entire event has been a training exercise to cull the weak recruits from the new batch of Mandalorian Protectors prior to them taking up service for the Yuuzhan Vong—since, as mercenaries, the Mandalorians go for the highest bidder, and the Yuuzhan Vong are currently the richest ones in the galaxy. The Mandalorians then take off, leaving Han behind.

This story is referenced in The Official Star Wars Fact File 117 and The New Essential Guide to Weapons and Technology. However, the role of Han in it is questionable, since as of The New Jedi Order: The Unifying Force he and Fett had not met in a long time. However, Karen Traviss' e-book Boba Fett: A Practical Man confirms that Fett was purposely trying to mislead the galaxy into believing the Mandalorians were working for the Yuuzhan Vong. This was a ruse to deceive Nom Anor and the Vong, so that Fett could learn about them and then strike at them from close range. It appears Han was at the wrong place at the wrong time, which allowed Fett to use him as a patsy who would spread the word of the Mandalorian's "defection" to the Vong.