Percy the Piebald Pony is settled in his new home. A new pony, a miniature Shetland Pony called Mike, arrives at the stables and is put in the same field with Percy. Mike is mischievous and, soon bored, he persuades Percy that they should escape. They manage to get out of their field and make it to the town's high street, causing attention and mayhem even when trying to fit in. After the town they enter the forest and meet a family of deer and make friends and have something to eat before heading back to the stables. Thankfully they have not been missed but have had a great adventure.