Anna Byrne is a jailhouse librarian. Most days, she loves her job and shares the life-affirming power of books. But some men never had a chance. Like Michael Hudson, who's been locked up awaiting trial before his sudden release. He's happy and relieved but can't shake the question preying on his mind: how comes the witness who put him behind bars is suddenly refusing to testify? From the award-winning producer and writer of "The Wire".