Another of the Josephine Tey books published by Penguin in 2022 is The Daughter in Time (1951).

Inspector Alan Grant is in hospital and begins investigating the story of Richard III and the allegations he had ordered the murder of 2 nephews - 12 year old Edward, Prince of Wales (b. 1470) and briefly Edward V, King of England (although never crowned) and his younger brother, Richard, Duke of York (b. 1473).

Grant concludes that the allegations against Richard III are unwarranted.

However, it does seem to be the case that the 2 boys were living in the Tower of London and were away from their parents.