Juniper Sawfeather is choosing which college to attend after graduation from West Olympia High School next year. She wants to go to San Diego to be far away from her environmental activist parents. They expect her to think the way they do, but having to be constantly fighting causes makes it difficult to be an average 17-year-old high school student. Why do her parents have to be so out there? Everything changes when she and her father rush to the beach after a reported oil spill. As they document the damage, June discovers three humans washed up on the beach, struggling to breathe through the oil coating their skin. At first she thinks they must be surfers, but as she gets closer, she realizes these aren't human at all. They're mermaids! Now begins a complex story of intrigue, conspiracy and manipulation as June, her parents, a marine biologist and his handsome young intern, her best friend, the popular clique at school and the oil company fight over the fate of the mermaids.

Juniper Sawfeather seems to have a talent for finding mythological creatures. Or maybe the creatures are finding her. The mermaids she saved from the oil spill are long gone. There’s no evidence of them, and she’s been branded as a liar and a fake in the media and at school. Her environmental activist parents have moved on to a protest to save Old Growth trees from being chopped down. June isn’t particularly concerned with this cause until after falling asleep at the base of a giant tree she wakes to find herself 40 feet in the air on one of its branches! From this point on she becomes obsessed with the tree, and it appears the tree is becoming obsessed with her too. Soon, she is trapped 170 feet above the ground, and the magical spirit that resides in the tree isn’t interested in letting her go free or allowing anyone else to save her. Is the tree spirit good or evil? Will Juniper’s feet ever touch the ground again?

Three warriors asked the sun to grant them wishes of immortality to protect their people forever. One was turned into a merman, another was turned into a tree, and final warrior was turned into a stone. Juniper Sawfeather has learned there is truth to this American Indian legend. She knows how it connects the mermaids she saved from an oil spill and the ancient spirit that trapped her in the branches of an Old Growth tree. Now she wants to find out if the final part of this legend is that some kind of magical stone exists. A lone mermaid finds her and shares a vision of a cliff along the ocean shore. This must be the place, and June knows she needs to find it. Tragedy happens when her parents take Carter and her on a mission to the San Juan Strait to collect evidence of construction run-off pollution, and they are attacked by a killer whale. June is convinced that the killer whale was led by mermaids, and she is desperate to find out why they attacked and where they are hiding. Once again, Juniper is on a heroic mission, the most frightening adventure yet. A thrilling ending to this award-winning trilogy!