Josh Jensen is the self-perceived master of the underwater world and knows no fear. Until he almost drowns scuba diving with his friends in the calm crystal clear waters of a beautiful North Florida spring on a warm sunny day. Rattled by the wakeup call and unencumbered by wisdom, he decides to pursue training to master the cold water-filled dark places beneath a ceiling of impenetrable rock. Soon he and his divemates realize this sort of class isn't just an easy lap around the pool. Their overbearing and harsh instructor challenges them to come to terms with life and death with only seconds...

High school, junior year, and Emma is barely getting by, head down as she stays low on the social radar. Sadie, her best friend and constant companion, craves attention and understanding as much as Emma does. The two of them find strength and comfort in their friendship while surviving one crisis after another. Thing is, Sadie only weighs four pounds, stands ten inches tall and talks to Emma by barking. Until Emma notices something very unusual - Sadie displays a high degree of intelligence. Way intelligent. As in Emma and her learn how to communicate intelligent. Just the two of them, by...