Acheron Press reprint, unusually it's not out of copyright
Plato: Letters to my Son (2013) by Neel Burton
A novel inspired by an obscure and apocryphal fragment in Diogenes Laertius purporting to be Plato's will, in which the great philosopher bequeaths his possessions to his son Adimantes. Burton runs with this idea, 'channelling' Plato dictating letters to this mysterious son from his deathbed. Plato never married, and moreover was likely a homosexual who overtly eschewed family life. Therefore, this intriguing literary device leaves the reader guessing as to the boy's true relationship to the much older man
http://www.amazon.com/dp/B00BPYNAXE/
http://www.amazon.co.uk/dp/B00BPYNAXE/
http://www.amazon.ca/dp/B00BPYNAXE/