Little Bee chapter books! Can the Freddy von Frankenstein brave the dark tunnels beneath the palace with his brother and sister to find and help a powerful fantastical?

Freddy, F.M., and Riya decide they need to find out what's drawing fantasticals to their home after a swarm of sprites descends on the palace. But to do so, they'll need to venture down into the dark, windy tunnels below the palace again. After Freddy and Riya argue about which way to go, suddenly, a gust of magic wind steals their voices! Can they set aside their differences to figure find the magic source and get their voices back?