Misteryo sa Tuwa (English: Joyful Mystery) is a 1984 Philippine period drama-political thriller film written and directed by Abbo Q. Dela Cruz.

Set in the town of Lucban, Quezon in 1950, three men Ponsoy (Tony Santos Sr.), Mesiong (Johnny Delgado), and Jamin (Ronnie Lazaro) discovered and retrieved a suitcase from a plane crash site and never reported it to the authorities and when the authorities approach Alcalde Valle, the town's mayor, to help find the suitcase, the latter made a sinister plan to steal the money for his greed.

It also stars Amable Quiambao, Alicia Alonzo, Maria Montes, Vangie Labalan, Lito Anzures, and the extras in the film that tackles greed, corruption, and hatred.

On the other hand, the three men Ponsoy, Mesiong, and Jamin steal a suitcase belonging to a dead American passenger from the plane crash which they vow not to report to the authorities.

As the film progresses, the motivations of the characters are exposed one by one as they continue to be victimized by torture, abuse, and violence as the contingent of soldiers begin their final assault to kill the pillagers in the mountains as an act of revenge for their violent attack in the village.

By the time they arrived, the celebration started to become joyous when the villagers began to enjoy the music, dancing, and the food and drinks they served.

Within the mountains, the trio was tied up and held hostage by the men led by Castro, whom Captain Salgado noticed his unusual behavior in the previous days.

Later on, the trio continued to be tortured one by one while their whole bodies (except their heads) were buried in the ground until the captors decided to kidnap Jamin's lover, Ising.

At night, while Benito is on his way home from fishing, he discovers the location where the captors torture and hostage the trio and he even witnesses the intimidation done by Castro to Ising.

Moments later, Mayor Valle and Santos finally reached the location, and despite discovering that Castro and the others were killed, they found the briefcase lying on the ground.

Misteryo sa Tuwa was released by the Experimental Cinema of the Philippines on December 25, 1984, as part of the 1984 Metro Manila Film Festival.

[3] The restored version was premiered on November 11, 2019, at the Ayala Malls Manila Bay as part of the Cinema One Originals film festival.

He praised the film's storyline and settings, the cast members, Rody Lacap's cinematography, and production designs by Rodell Cruz and Don Escudero.

[5] Hayley Scanlon of Windows on Worlds described the film as "both a tale of human greed and selfishness", owing to the scenes that were alluded or referenced to the then-Martial Law era.