Dublin in the 1880s is the home of Dan Lowrey's music hall, the elegant tea rooms of the Phoenix Park, and the stylish Trinity College boat races.
It is also the home of an unpredictable and unruly nationalist undercover movement called the Invincibles.
This fast-moving story unravels against a backdrop of hatred, violence, bigotry and injustice, and for Kate and Scott the ultimate anguish of their divided loyalties.