Princess Magnolia is having hot chocolate and scones with Duchess Wigtower when ... Brring! Brring! The monster alarm! A big blue monster is threatening the goats! Stopping monsters is no job for dainty Princess Magnolia. But luckily Princess Magnolia has a secret -- she's also the Princess in Black, and stopping monsters is the perfect job for her! Can the princess sneak away, transform into her alter ego, and defeat the monster before the nosy duchess...

The Princess in Black and her faithful pony Blacky are called upon to rescue Duff and his goats from an invasion of cute, seemingly harmless bunnies from Monster Land.

Noseholes and elephants! A pet-eating monster interrupts a perfect playdate with Princess Sneezewort ... but who is that new masked avenger? Princess Magnolia and Princess Sneezewort have plans ... mysterious plans, like a princess playdate! They dress-up slam! They karaoke jam! They playhouse romp and snack-time stomp! But then a shout from outside Princess Sneezewort's castle interrupts their fun. It's a monster trying to eat someone's kitty! This...

"The Princess in Black, the Goat Avenger, and more masked heroes and their trusty companions pool their talents together to vanquish a monstrous stink. Aligned to Common Core Standards and correlated to state standards. Chapter Books is an imprint of Spotlight, a division of ABDO." --

"The Princess in Black and her friends are enjoying a day of sun and sea on Princess Sneezewort's royal boat when a real, live mermaid princess emerges from the waves! Eeeeeee! Princess Posy needs their help protecting her very cute sea goats from being eaten by a very greedy kraken. But the princesses and the Goat Avenger quickly realize that fighting underwater can be tough for land dwellers, and only the mermaid Princess Posy can save the day....