LRD Useful overviews I kept going back to when studying were Anthony Tuck, Crown and Nobility 1272-1461 and Maurice Keen, England in the Later Middle Ages.
Personal top recommends would be:
Anything by K B McFarlane, the Daddy of the 15th C. Incredibly influential, changed the way we thought about "robber barons" and such. His books are hard to get hold of and very dry, but also very elegantly written.
Shaping the Nation by Gerald Harriss (part of the new Oxford History of England, haven't read it all but it's the new standard history really)
The Wars of the Roses by Christine Carpenter.
Henry VI and the Politics of Kingship by John Watts.
(McFarlane taught Harriss, who taught Carpenter, who taught Watts, so this is slightly a nested "school" of fifteenth century studies.)
Otherwise, here is a page with a pdf reading list which has an amount of books on it which I believe could best be measured in "metric fucktons". 
If you click into paper 4 on same page maybe there will be something about Catherine Howard on that list?