As the police force of Albany, Georgia, attempts to stop gangs and drug dealing activity in the city, the sheriff urges his deputies to spend time with their families, citing research that shows fatherless children are several times more likely to get into trouble in life, including crime. Among his deputies are Adam Mitchell (Alex Kendrick), Nathan Hays (Ken Bevel), Shane Fuller (Kevin Downes), and rookie David Thomson (Ben Davies). Mitchell adores his young daughter, but is distant from his teenage son. Hayes never knew his biological father but would risk his life to save his two children; however, his teenage daughter Jade (Taylor Hutcherson), resents him because he has strict rules about dating. Fuller is divorced, as were his parents, and has joint custody of his son. Thomson is young and single. The group also befriends Javier Martinez (Robert Amaya), an immigrant struggling to provide for his family, and Mitchell recommends him to a new full-time job, where he is hired.
Mitchell's nine-year-old daughter is killed by a drunk driver, devastating Mitchell and his family. Following his daughter's death, Mitchell reads a lot about fatherhood in the Bible. He decides he must be a better father and crafts a detailed "Resolution" to honor God in every aspect of his family. Mitchell, Hays, Fuller, Thomson, and Martinez join him in his resolution at a formal ceremony conducted by Hays's neighborhood mentor, the man he thinks of as a father. Mitchell rebuilds a relationship with his son and receives some relief of his guilt at his daughter's death. Hays mends his relationship with his daughter and presents her with a purity ring that he asks her to wear until she is married. He also visits the grave of his biological father who he had never met and forgives him. Fuller improves his relationship with his son. Thomson reveals that he fathered a child in college and deserted the mother after she refused to have an abortion. He writes the mother a letter seeking a relationship with his daughter and encloses some support money. Martinez's factory employer offers him a promotion on the condition that he falsify inventory documents. Martinez refuses, and his boss reveals that the request was a test of Martinez's integrity. The boss promotes Martinez and gives him a raise.
Mitchell discovers that Fuller has been stealing drugs from police evidence. Mitchell decides he must honor his Resolution and decides to report the corruption. He sets up a sting leading to Fuller's arrest and imprisonment. Mitchell visits Fuller in jail where Fuller takes responsibility for his actions and asks Mitchell to look after his son, which Mitchell agrees to do.
During a minor traffic stop, Hays and Thomson unknowingly confront the armed leader of a gang they have been repeatedly encountering. The incident turns into a roadside gun battle, and the gang leader attempts to take a young girl hostage. Mitchell and other officers arrive as backup. The girl's father helps Hays subdue a suspect, and Mitchell assists in arresting a second suspect. One of the gang members is Derrick Freeman (David Howze), a teenager who Hays had earlier prohibited from dating his daughter; Derrick attributes his decisions to his lack of a father.
At a Father's Day church service, the men present the Resolution and Mitchell urges the fathers in the congregation to be a Godly influence on their families. Mitchell runs in a 5K race with his son and Fuller's son. Hays reads the Bible in prison with Derrick. Thomson meets his daughter for the first time.
The film ends with a quote from Joshua 24:15: "Choose today who you will serve, but as for me and my house, we will serve the Lord."