When Clairegoes back threw the stones she reads everything and anything she can get her hands on about Culloden, and is forced to give it up by Frank. In the books it is different. When she comes back she does not want to know what happened and until she goes to the U.K. with Brianna in 1968 she does not do any research as to what happened to the men she knew and what happened to them.
The title comes from the Bible, 1 Corinthians 13:12. In a Mirror, Darkly (2005) gets its title from the same verse.