Sister Garaele was tasked with finding the spellbook of the long dead wizard Bowgentle. She traveled to the lair of a banshee named Agatha to learn its location, but was unsuccessful in her mission and returned to Phandalin a few days later with minor injuries. Having done further research on interactions with banshees, she asked the party if they would try again on her behalf. She provided a jeweled silver comb as a gift to Agatha, and offered 3 potions of healing in exchange for the banshee's answer.
The party eventually made their way to Agatha's lair, asked for the whereabouts of Bowgentle's spellbook, and learned that Agatha had traded it to another wizard over 100 years ago. The party returned to Sister Garaele with this information, who was appreciative of the party's effort and rewarded them with the potions as promised.