Over the eastern mountains! Lately, Sara's life has been going swimmingly! She's been enjoying her time in Hydrangea with Nelly and her friends, with no pesky requests from the capital to deal with. However, all this changes when a pair of letters arrive at the Wolverié household from Nelly's sister Latifah, the wife of a lord in the lands to the east. One letter requests Nelly's presence, and the other, Sara's-as it turns out, there's a new Invited staying with Latifah's family, and this Invited needs Sara's help! And so, Sara and the gang head east, planning to take care of an infestation of green grass locusts while they're there. Will this journey finally be the thing to shake up Sara's quiet life for good?