Hi, been a while since I've participated in MTS, but I've had an idea for a novel and it won't let me go . . .

So I have an idea for a novel based around the Irish Troubles/IRA, bascically the premise is (modern day) the protaganist witnesses the murder of a high profile journalist (his father) by the IRA as a teenager (who had been investigating the 'missing bodies'). He is now a successful barrister, living under a different identity in England. His grown-up son is a post-doctoral researcher (doesn't know about his family's past), and uncovers information which reveals his father's identity to the unsolved murder, and the killer who doesn't want to be identified.

My worry is, that for the last few years I've been writing Roman Historicals, which are very research heavy. My knowledge of the Irish Troubles is superficial (being on a young teenager when the Good Friday Agreement was signed), and I will need to educate myself. But how much reserach is too much research?