Case of the Christmas Concert Catastrophe-Hardcover

What do glitter snowflakes, aliens, and singing have in common? Join the Gumshoe Gang at Watson Elementary as they solve the latest mystery. Lyra is so excited for the Christmas concert that she has a hard time focusing on anything else. That is until someone starts sabotaging the decorations needed for the concert. Who would want to get the concert canceled? Why are the teachers acting so strangely?