Squidapus read this in a day sooooo yeah. A non-magic sister gets called to a magic school her sister teaches at to solve a murder. It very early in separates itself from being a variation on Harry Potter and takes a more down to earth but still fantastical setting. He really really enjoyed the relationship between the two sisters as it was very complicated and relatable. Squidapus understands the ending may not satisfy readers but he liked it.