Mother of Pearl
The fourth book of the New Scales and Tails series. Avery thought going to middle school was big, but when a big moving truck pulls into the empty house across from them, all thoughts of school are gone and replaced with worry as she realizes that the boy across from them is Trevor, the boy who saw them on the cruise ship! Awhile Trevor tries to expose Avery's, Katie's, and Jake's secret, Avery uncovers mysteries and a deadly curse. On top of this all, someone becomes too close to Avery, and they finally uncover her fishy secret.