Mr. Monk Goes to the Carnival (S01E04)

Hotheaded police detective Adam Kirk agrees to meet a mysterious informant named John Gitomer on a moving Ferris wheel high above a local carnival. Moments after the ride begins to move, however, Gitomer starts screaming in agony. The Ferris wheel operator brings the ride to a halt, Detective Kirk leaps out, and he turns to find Gitomer with a knife in his heart. Now the informant is dead - and no one but Kirk could have done it. Captain Stottlemeyer, Kirk's former partner, is determined to clear Kirk's name. But given the overwhelming evidence against Kirk, doing so may prove difficult. Fearing the worst, Stottlemeyer has no choice but to bring in Monk. (iTunes)