Razorblade Tears is a thriller novel by S.A. Crosby.   Two hard ex-cons unite after their sons are brutally murdered.    Although the fathers were homophobes and were distanced from their gay sons, they did love them in their own silent and rough manner.    One of the fathers is black and the other is a somewhat racist white man, but they find common ground to seek justice for their sons.   They soon come to realize that they will need to exact revenge themselves and what follows are raw, action-packed sequences, with lots of blood spilled.   Between these sections, the fathers reconcile their feelings for their families and vow to protect those who are left.   This is a quick-moving visceral story, well-crafted by the author.   Recommended, but with a note of caution about the level of violence.   4.5/5 stars