Bridge designer Howard Johnson was framed by Harlan Lee, imprisoned for 15 years after a bridge collapse. He infiltrates his son Chase Johnson's construction site, discovering fatal flaws. When the bridge collapses, he uncovers the mastermind. Harlan Lee blows up the bridge to destroy evidence. Howard exposes the conspiracy, defends the bridge, clears his name, and brings the villain to justice. The father-son rift is healed.