Sophie is an amateur naturalist with a rare genetic gift: the ability to see a marvelous kingdom of invisible, sentient creatures that share a vital, symbiotic relationship with humankind. To record her observations, Sophie creates a personal bestiary and, as she relates the strange abilities of these endangered beings, her tales become extraordinary meditations on love, sex, evolution, extinction, truth, and self-knowledge.

Common Invisible Beasts: The Couch Conch -- Feral Parfumier Bees -- The Keen-Ears -- The Pluricorn -- Truth Bats -- The Wild Rubber Jack -- The riddle of Invisible Dogs -- Air Liners; Imperiled and extinct invisible beasts: The Antarctic Glass Kraken -- The Spiders of Theodora -- The Foster Fowl -- Beanie Sharks -- The Golden Egg; Rare Invisible Beasts: The Oormz -- The Hypnogator -- Grand Tour Butterflies; Invisible Beasts in print: Think Monkey -- Fine-print Rotofers; Cyclically Invisible Beasts: Beacon Bugs; Epilogue: The naturalist reads a love letter, with Plato and a Dog.