Jim finally tells Cat the truth. The episode flashes back to the days before Mary's death, and the chain of events that led to her fall are revealed along with Jim's truth.
Cat struggles to get her suspicions taken seriously after her mother's mysterious death. She tracks down an old friend from her past who may be able to shed light on the present.
Jim returns home to find his daughter has contracted the same illness as her mother. His attempts to reconnect with his family only cause them more pain.
On the day of Paul and Fiona's twins First Communion, Paul is nowhere to be found, but shows up just in time to attend the ceremony. Later at the pub he and Jim go off to take care of another matter while the three adult siblings reunite.
Dez Breen continues with his interrogation of Fiona. Paul is faced with an impossible decision: will he follow Kian's orders or stay loyal to his friends?