Describes the discovery and observation of the planet Neptune and what has been learned about it, particularly from the Voyager spacecraft mission.

"Discusses the planet Neptune, including observations by ancient cultures, current knowledge of Neptune, and plans for future scientific research and space exploration"--

"STEM highlights and information about recent scientific discoveries teach readers about Neptune, from its geography and climate to the ways it has been explored and what scientists hope to find out in the future."--

Describes the fourth largest known planet in the solar system, examining its size and composition, its surface features, its orbit, and efforts to learn more about this planet.

"A kindergarten-level introduction to the planet Neptune, covering its orbital process, its moons, and such defining features as its dust rings, winds, and name" -- website. "Una introduccín al planeta Neptuno para niños de kindergarten. El libro incluye su órbita, sus lunas y características propias como sus anillos de arena, sus vientos y su nombre" -- website.

Reunited with her merman father and now living on an island located in the Bermuda Triangle, twelve-year-old Emily accidentally awakens the fearsome kraken and also faces a bully from her past.

When Neptune tells Emily and her merman father and human mother to return to Brightport to try to make merpeople and humans work more closely together, Emily faces problems with old enemies, her new, half-merfolk friend Aaron, and a mystery related to a group of legendary lost sirens.

When she incurs Neptune's wrath by finding a diamond ring buried under rocks in the ocean, Emily is put under a curse that will force her to choose to be either a mermaid or a human and split up her parents forever.