The Book of Curses — Meg Hendry

Jamie at last has a home, but even in Frostpine he doesn't truly belong. There is trouble in Frostpine, a building unrest that Jamie's friend, Emer, is pulled into. When the dreaded Book of Curses appears to Jamie with a terrible request, he too is drawn into the search for the truth of what happened to the royal family. Jamie and his friends must find the truth before it's too late, or they may lose Emer, and the country will fall into chaos. The Book of Curses is a novella.