The Man Who Knew Too Much

American doctor Ben McKenna arrives in Paris with his wife Jo and son Hank following a medical conference. They are excited to explore Europe, starting their adventure in the culturally rich city.

While journeying through French Morocco, a tense moment arises when young Hank inadvertently removes the veil from a Muslim woman. This near catastrophe is quickly diffused by bystander Louis Bernard, who later engages the family in conversation about local sights.

The McKennas invite Louis Bernard to their hotel for dinner, but he suddenly cancels due to a looming threat from Rien, a hired killer. This cancellation adds an element of mystery and concern to the McKenna family vacation.

The following day in the marketplace, tragedy strikes as a man runs away from the police and collapses in Ben's arms, revealing himself to be Louis. With his dying breath, Louis warns of an assassination plot involving a statesman in London.

While at the police station, Ben receives a shocking phone call informing him that Hank has been kidnapped. The caller demands silence regarding Louis's warning about the conspiracy, further heightening the stakes for Ben and Jo.

After learning of their son's kidnapping, Ben and Jo realize the Draytons left on a private plane. Fueled by desperation, they resolve to travel to London to rescue Hank and uncover the truth behind the plot.

Upon arriving in London, the McKennas are met by a horde of fans and police. Inspector Buchanan reveals that he is aware of the reason behind Hank's abduction, leaving Ben in a dilemma about how much to disclose regarding Louis's message.

After a brief call with Hank through Mrs. Drayton, the McKennas check into a hotel and attempt to connect with Ambrose Chapel. Amid distractions from Jo's old friends, Ben sneaks out to gather more information.

Inside Ambrose's taxidermy shop, Ben discovers that neither Ambrose Sr. nor Jr. is involved in Hank's disappearance. He barely escapes as law enforcement closes in, emphasizing the urgency of their situation.

At the church known as Ambrose Chapel, the McKennas discover Hank held captive by the Draytons. As a sinister plan unfolds involving an assassination at a concert, they must act quickly to save their son.

As the church service begins, Ben attempts to save Hank but is knocked out by Mr. Drayton. The police's arrival is too late, and the kidnappers escape with Hank despite the McKennas' best efforts.

Ben escapes and makes his way to the concert venue where Rien prepares to assassinate the foreign prime minister. Jo's inadvertent shout disrupts the attempt, adding chaos to the situation.

Ben confronts Rien just after the assassination attempt fails. In a fierce struggle, Ben manages to outwit the assassin, leading to Rien's tragic fall and a crucial turning point in their chase for Hank.

With the Draytons hiding in the embassy and the assassination attempt thwarted, pressure mounts as Mrs. Drayton urges the ambassador to eliminate Hank. The McKennas take bold steps to enter the embassy in a bid to protect their son.

In a climactic finale, Jo's performance at the embassy resonates with Hank, guiding Ben to his location. With an intense confrontation, they ultimately rescue Hank and leave the ordeal behind, culminating in a heartwarming family reunion.