Scarlet and Ivy are a set of twins in the 1930s. In the first book, Ivy is shocked to be told that her sister, Scarlet, has died at boarding book school. She is invited to take Scarlet’s place at the school, but she is forced to pretend to be Scarlet. Fortunately, Scarlet has left Ivy messages and clues about what happened to her and the sinister things that are happening at the school. Ivy is able to save Scarlet, and the two of them continue to attend the boarding school, solving its mysteries and learning some secrets about their own family.

The series is by Sophie Cleverly.

The Lost Twin (2015)

Ivy is summoned to her sister’s boarding school to take her place after her sister has supposedly died, but things aren’t what they seem, and sinister things are happening at the school.

The Whispers in the Walls (2015)

The Dance in the Dark (2016)

The Lights Under the Lake (2017)

The Curse in the Candlelight (2017)

The Last Secret (2019)