Exiled Liverpudlian, Bernie Fazakerley, makes a sentimental journey back to her home city to visit relatives and to take her daughter, Lucy, back to their roots. Before long, events take a sinister turn when they are witnesses to a murder aboard the famous Mersey Ferry. Then the killer strikes again, and the race is on to make an arrest before more lives are lost. Who could have wanted to kill a young Roman Catholic priest? And is Bernie's own life under threat?