Piggley, Ferny, Dannan and Molly just can't resist eating one of Mrs. Winks's fresh-baked pies...even though she told them it was off limits. The friends decide to pool their creativity to bake a new pie before Mrs. Winks finds out. After much hard work - and a run-in with a feisty goat who refuses to share the apples in his orchard - the kids realize that a simple apology might have been easier and wiser in the long-run.
Piggley has a big test coming up in school and hates the thought of giving up an entire weekend to study. He decides instead to catch the legendary 'Salmon of Knowledge,' an all-knowing fish that can help him ace the exam. While Piggley puts his faith in a questionably magical fish, Ferny and Dannan study. Ferny and Dannan are the ones who ace the test - and Piggley learns an important lesson.
Piggley's father tells him an old Irish tale about fairies disguising themselves as bugs and playing tricks on anyone who harms them. Soon Piggley and Dannan are convinced that fairies have turned Ferny into a flying beetle after he inadvertently smacks a bug on his arm. While Piggley investigates and experiments with ways to keep Ferny safe, Dannan hits the books to try and find a cure - and Ferny learns how much his friends care about him.
Piggley's favourite radio program, 'Piggley Trotter, Private Eye,' inspires Piggley, Ferny and Dannan to spend many imaginative and adventurous afternoons playing detective. One particular afternoon, they work together to solve an unusual mystery - the case of 'what a teacher does on his day off.'
Mr. Winks is going fishing and Piggley and his friends really want to go along. Dad doesn't think they're ready for the trip, so the three friends set out to prove that they're not only ready, they're also willing and able! They work hard to earn the privilege by doing chores around the farm, then they pull out all the stops and use their imagination to show Dad what excellent fishermen they will be. At last, off they all go for some early-morning fishing.
Piggley accidentally embarrasses his good friend Ferny by taking a photo of him with his pants ripped and his undies showing! After promising not to show it to anyone, the photo gets away from Piggley and is seen by everyone at school. He tries to apologize but finds that, for the first time, his best friend Ferny isn't willing to accept his apology. Piggley must use his ingenuity and creativity to regain Ferny's trust and friendship - and Ferny must find a way to forgive.
Young Piggley's insecurity rises when he discovers that his teacher, Mr. Hornsby, is coming to his house for supper. Piggley is certain he's going to 'grade' the Winks family and that they'll come up woefully inadequate! So Piggley and pals hatch a plan to make sure the Winks family gets passing marks. Much to Piggley's surprise, he discovers that Mr. Hornsby is just a regular person - and not so intimidating after all.
A series of odd circumstances convinces Piggley that Molly's new doll is actually a real leprechaun in disguise! Piggley and his friends set out to prove his theory and try to catch the leprechaun at his own game. They soon learn, however, that it's a good idea to get ALL the facts before jumping to conclusions.
When Piggley, Ferny and Dannan hear strange noises in the barn, Piggley decides it's the 'song of the banshee'-which frightens Dannan more than she wants to admit! When she finally confesses her fear to her friends, they search for the source of the noise...and discover it's only Wiley the sheep trying to lead his uncooperative flock in song.