The naughtiest unicorn and the spooky surprise

It's the SPOOKIEST time of the year at Unicorn School! Mira and Dave the naughtiest unicorn are looking forward to dressing up for trick-or-treating, pumpkin carving and apple bobbing (well, doughnut bobbing for Dave). But when a strange new teacher arrives at school and the other teachers start to disappear, Mira and her friends suspect that something spooky is going on. Can they get to the bottom of what's going on, or are they in for a seriously spooky surprise?.