When the mythological and literary troublemaker Puck shows up, the Charmed Ones know there's going to be mischief and mayhem! Puck is as curious as he is mischievous, and quickly devises a plan so he can see the Power of Three in action: the circus has come to town, and Puck knows of an Innocent in need of protection. At the circus, the three sisters must find the one in peril while a devilish, shape-shifting Puck leaves them second-guessing their every move. With an unknown Innocent in danger and time running out, will the Charmed Ones be able to outsmart Puck and defeat evil before it's too late?