Prey is a British thriller series. In the second series (2015) Philip Glenister stars as prison officer David Murdoch who is manipulated into freeing a woman prisoner in order to save his pregnant daughter.

As events get out of control and Murdoch becomes complicit in crimes, it is revealed that the woman prisoner and her behind-the-scenes brother were in foster care.

The foster care backstory is presented as sufficient explanation for criminal behaviour.