While visiting her in the hospital, Élina discovers that her grandmother is the Keeper of the Little Folk, protecting fairies, nymphs, naiads, and other fantastical creatures! And now, her grandmother is ready to pass her responsibilities on to Élina. It’s not a moment too soon—Llyam and Nelvyna, creatures of the Little Folk, have sent up a distress signal, because a naiad has gone missing from Bird Lake. Will Élina be able to figure out how to see the fairy creatures in time to help them in their search?

Élina's adventures continue in her new role as the Keeper of the Little Folk, protecting fairies, gnomes, and other fantastical creatures. But in order to keep seeing them, she's going to need to whip up a new batch of fairy balm, and a crucial ingredient is missing: dragon tears! But not even her grandmother can tell her where to get them... Luckily, there's the library, and Élina finds an Arthurian legend that tells of a dragon turned to stone in the Brocéliande forest in Brittany. There just so happens to be a summer camp nearby, if only Élina's mother would allow her to go...