Deuce Bigalow, a gentle-hearted American fish tank cleaner, is dragged back into the world of male companionship when his former mentor, T.J. Hicks, is framed for a series of bizarre murders targeting Europe's elite gigolos. Motivated by loyalty and a desire to clear his friend’s name, Deuce travels to Amsterdam, a city wrapped in eccentric charm and danger. Upon arrival, Deuce discovers that T.J. has fallen from grace, reduced to running a failing floating brothel and despised by the European gigolo community, who are led by the arrogant and aristocratic Heinz Hummer. Desperate for answers, Deuce reluctantly re-enters the profession to infiltrate the elite circle of male escorts and uncover the true killer. However, Deuce's unique approach to companionship remains utterly unconventional. Instead of smooth sophistication, he brings an array of bizarre physical ailments and total social cluelessness to his appointments. Despite his lack of traditional charm, Deuce's bizarre empathy and genuine kindness inadvertently win over his troubled female clients, each of whom carries exaggerated physical or psychological quirks. From a woman with severe Tourette's syndrome to a towering giantess and a lady with a severe facial deformity, Deuce treats every client with deep respect and unexpected tenderness. As Deuce navigates a series of escalating misadventures, he teams up with Eva, a passionate and cynical activist who initially detests gigolos but slowly falls for Deuce's surprising moral integrity. Meanwhile, the real killer continues to strike, eliminating top-tier escorts with customized gardening shears. Deuce uses his undercover rendezvous to gather clues, eventually realizing that the murders are not random.
The investigation culminates at a high-society masquerade ball where Deuce confronts the mastermind behind the frame-up. It is revealed that Heinz Hummer, consumed by professional jealousy and a desire to monopolize the European escort market, is the serial killer. A chaotic, slapstick confrontation ensues, involving flying furniture, unexpected chemical sprays, and the intervention of Deuce’s eccentric clients, who band together to protect him. Hummer’s crimes are publicly exposed, and T.J. is finally exonerated of all charges, restoring his reputation and reclaiming his status in the community. With his mission accomplished and his name cleared, Deuce finds
unexpected romance with Eva, who embraces his weirdness. Deuce realizes that true connection transcends superficial beauty, proving that his unique brand of love can heal even the most bizarre hearts. He leaves Europe a changed man, having found both purpose and enduring love abroad.