An only child finds her life turned upside down when her father reveals that, over the course of his prize-winning career as a pioneering fertility doctor, he used his own sperm to conceive upwards of a hundred children, including two new sisters.

When his beloved dog goes missing, a young man embarks on an incredible search with his parents to find him and give him life-saving medication.

Thirteen years after disappearing and presumed drowned, Matt returns home to his mother Sarah. Suspicions grow when her older son Ian is injured in a car accident similar to the one that recently killed his father.