Sixteen-year-old Ari Wyndham lost her best friend in the sea.
Everybody told her it was an accident, but Ari can't forgive herself.
Her own life is cut short when a tiger-snake delivers a deathly bite, and a beautiful, ghostly and strangely familiar young woman appears, summoning Ari's soul to the underworld.
Ari, however, refuses to go.
Though she knows there will be a terrible price to pay for her transgression, the mysterious guide chooses to save Ari.
Their rebellion upsets the balance of li.
