Fallout 4‘s mod, Fallout: London has many fun and interesting side quests that players can take on for plenty of XP and rewards, including the ‘Catching Up’ quest. This mission is exclusive to the Vagabond faction, which players can join upon completing a quest for them beforehand. Upon doing so, players will meet Sabertooth Syd, an NPC who requires your help in infiltrating Churchill Library to pick up some books.