Where are the books that the templar wants from the Tomb of the Skeleton King?

He can be talking about the book that drops from Jondar, where he discover some information.

As they journey together the Hero begins to ask Kormac about his past prior to joining the Templars, of which Kormac has no memories. He explains that like many Templars he was once a criminal who was purged of his evil ways and made to serve the light, forgetting his past. The Hero continues to as ask Kormac if he ever wantes to learn of his past, and persuades him to look into it, using the information from a book that his traitorous comrade Jondar had in his possession.

As Kormac reads the book he grows worried that he could be being corrupted like Jondar was, and fall back to his old away. Kormac finds information on the Order that shocks him, and comes to a passage which undoes the spell that removed his memories when he reads it, allowing him to remember his past.

Source

It is possible that the tomes would normally appear on lecterns, but when the Templar is with you, you won't get the books but random drops instead.

See this forum post and this entry on lecterns at diablowiki.net.