"Blood for Blood" is a phrase often associated with the concept of revenge or retribution, suggesting that one must pay back a wrong with a similar act. This idea is prevalent in various cultures and can be seen in literature, film, and historical contexts, where familial loyalty and honor drive individuals to seek vengeance for perceived injustices. In literature, "Blood for Blood" can also refer to specific works, such as the novel by Ryan Graudin, which explores themes of loyalty, sacrifice, and the consequences of violence. The story delves into the complexities of relationships and the moral dilemmas faced by characters caught in cycles of revenge.