Dublin is well established as both a character and a setting in modern literature. Much of the city's fame comes from such cameos - such was the so-called 'Normal People bounce' that applications to Trinity were reported to be up 11pc. Open Water by 27-year-old Caleb Azumah Nelson, the just-released debut novel, which is already being compared to Normal People - and looks set to have a similar cultural footprint - also features the city as supporting cast.