''The Underneath'' is a 2008 novel by Kathi Appelt.

The book, loosely based on one of the author's own experiences, features an expecting calico cat mother who wanders off into a ramshackle house, having followed by the howls of an old, chained up hound. She befriends the dog, named Ranger, and has her kittens in the Underneath, a hideout under the porch of the house. She names them Puck and Sabine, and they are warned not to leave the Underneath.

Unfortunately, Puck does just that, and his overt curiosity provokes the attention of Gar-Face, the cruel hunter who resides in the ramshackle house.

Meanwhile, Grandmother Moccasin, a lamia, awakes after a thousand-year rest, and laments her past, involving her only daughter, Night Song, being lost to Hawk Man. All the while, her "brother", the Alligator King, is the prime target of Gar-Face

With themes of loss, love, and mystery, the book is filled with {{Tear Jerker}}s.
!!Tropes found in this work include:

* AbusiveParents: Gar Face's father, who [[spoiler:scarred his face, thus his name.]]
* AfterlifeAntechamber: The hummingbird [[spoiler:AKA Night Song and Hawk Man's daughter]] serves as this, as the messenger to the recently dead who guides them to a vague afterlife.
* CuteKitten: Puck and Sabine, though their cute antics don't end well for them.
* CruellaToAnimals: Gar Face is a bit too happy about abusing and killing various animals.
* DeathByDespair: [[spoiler:Night Song]] after she is [[spoiler:unable to see Hawk Man thanks to ModeLock.]]
* EmergencyTransformation: [[SubvertedTrope Subverted]] when [[spoiler:Hawk Man]] is slowly dying form grandmother's venom, but refuses to shape shift to heal himself because it would ModeLock him into [[spoiler:a hawk]] and thus allow him not to [[spoiler:see Night Song again, since he's still holding out the hope that she will come back.]]
* ExitPursuedByABear: [[spoiler:Gar Face]] ends up [[spoiler:being eaten by the alligator king when he tries to kill him.]]
* FreudianExcuse: Not quite an excuse, but Gar-Face is somewhat sympathetic due to his face being [[spoiler:scarred by his abusive father]]. Not much of one, though, because even before that he poisons and kills birds just to torment his mother.
* HeelFaceTurn: A very heartwarming one. [[spoiler:"Grandmother, who had spent a thousand years in a jar, had finally chosen love. This time she did what she could to help it along." She'd broken the chain tying Ranger to the tree.]]
* IronicEcho: Throughout the book, Grandmother Moccasin repeats to herself, "There is a price." [[spoiler:In the end, she realizes the price isn't a punishment for her betrayal. The price was sorrow, sorrow for interfering with love. Before she dies]], she realizes that her words are true, but not in the way she thought.
* ModeLock: All shapeshifters can only transform into a human and back once, after which they are stuck in their animal form permanently.
* MutualKill: While not strictly deadly for one side, [[spoiler:Hawk Man]] manages to lock Night Song in a jar while being hit by her venom.
* NearlyNormalAnimal: Most of the cast is this.
* TheNameless: The name of the calico cat is never revealed.
* OrphansOrdeal: Very much so. Puck goes through a lot after losing his family [[spoiler:with one of his parents being dead]], as well as [[spoiler:Hawk Man and Night Song's daughter.]]
* SealedEvilInACan: Grandmother has been trapped in a jar for a thousand years.
* SerpentOfImmortality: Grandmother is a lamia trapped in snake form who is thousands of years old.
* SnakesAreSinister: Grandmother at times, [[spoiler:tricking her daughter into transforming permanently into her snake form to keep her away from Hawk Man]], though she regrets [[spoiler:her daughter's resulting death]] and ultimately [[spoiler:breaks Ranger's chain.]] Night Song, on the other hand, is clearly not sinister.
* StarCrossedLovers: Night Song and Hawk Man. Grandmother is ''not'' happy with their relationship.
* StrongerWithAge: Why the alligator king is so huge.
* ThreeLinesSomeWaiting: The plot is split between the family at the Underneath, [[spoiler:Puck, while he is alone after Gar face tries to kill him]] and Grandmother's story from a thousand years ago, which only connects to the main plot much later in the story.
* NeverSmileAtACrocodile: The Alligator King, who [[spoiler: manages to devour Gar-Face whole]].
* YouHaveFailedMe: Ranger is hated by Gar-Face for refusing to kill a bobcat because she had kittens.
* {{Xenofiction}}: Pretty much all of this book is from the perspective of animals.