Lacuna, Part the First is the 55th chapter of Inheritance. It takes the point of view of Eragon.
Trivia[]
The name of this chapter is taken from the word Lacuna, which means "gap", and is also the name of Lacunar Amnesia, which is a missing memory of a specific event. Thus the name foretells that Saphira and Eragon will be "missing" part of this experience once it is done.