Christmas morning, 1963. Fifteen-year-old Kitty Doherty gives birth in a cold, unfriendly Irish convent. She knows her beautiful baby boy presents a huge danger to her family s Catholic community back in Liverpool s Four Streets. When her baby is adopted by a wealthy family in Chicago, Kitty considers the problem solved. But soon it s obvious the baby is very sick and only his birth mother can save him.

In Liverpool, a charismatic new priest has arrived. As the Dohertys cope with the tragic consequences of Kitty s pregnancy, the police seem close to solving the double murder which rocked the Four Streets to the core. But now all that is about to be put at risk once again.