Shannon Hale

"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....

When she becomes part of the in-crowd, Shannon begins to question whether she wants to remain there, in a story about popularity, first boyfriends, and finding a path in life.

When the goat pasture is plagued with a foul stench, the Princess in Black and her friends must take on a stinky beast.

"Who says princesses don't wear black? When trouble raises its blue monster head, Princess Magnolia ditches her flouncy dresses and becomes the Princess in Black!" --

A sleepy Princess in Black takes a much-needed vacation and rides her bicycle to the seaside, where she plans to nap in a hammock, but her peace is disrupted by a roaring sea monster.

"The Princess in Black is ready for her snowy playdate with the Goat Avenger and the Princess in Blankets. It's a perfect day to build snow monsters and battle them for practice. But just when they're about to wage battle, a huge foot smashes their snow monster. "SQUASHY!" It's a giant, and it's smashing everything in its path! The giant is too strong for the three friends, so the Princess in Blankets has an idea: it's time to light the Sparkle Signal...

Conor, Abeke, Meilin, and Rollan, supported by their spirit animals, follow a lead in the cold North only to arrive in a deceptively beautiful village where everything is not as it seems.

While on her way to brunch with another princess, Magnolia, and her unicorn Frimplepants, transform into the Princess in Black and Blacky to respond to a monster emergency.

Kitty, who looks like a kitten yet feels she is actually a unicorn, begins to doubt herself as others ridicule her, until she meets a unicorn that helps her discover and embrace who she is.

The Princess in Black, who knows how to handle all kinds of monsters, meets her match in an adorable kitten bent on annihilation and must figure out what her finicky feline friend wants.