Fearing the Northern Irish action man would turn down a romantic role, which was actually created with him in mind, the film bosses turned to the rocker and asked him to get the script to the "Taken" star.
"My old pal Bono says, 'Read this... I couldn't stop turning the pages'," Liam tells "Good Morning America". "So I thought, 'OK, I'll read it...', and it was true. I literally couldn't stop."
Neeson teams up with revered British actress Lesley Manville for the new movie and it was a joy to work with someone he has admired for years.
"Working with her is like taking a walk in the park," he says.