Destroyer | | Scott Adkins) was once an excellent U.S. federal investigator. After the death of his wife Emma, he chose to retire and lived a solitary life with his daughter Carrie (Lily Ann Stubbs) incognito. By chance, a group of drug dealers broke into Martin's home. In order to protect his daughter, Martin killed them. In this way, Martin became a murder suspect, was detained, and made the news. The arms dealer Charles (James Cosmo), who had been sanctioned by Martin, recognized Martin's face on TV, so he sent a killer to assassinate Martin to avenge himself. In fact, Charles has another identity, that is, Martin's father-in-law. Emma's death was caused by Charles' mistake. Therefore, Charles hated Martin deeply.