It’s Always Sunny’s Kaitlin Olson is incandescent as a police-department cleaner with an IQ of 160 whose crime-solving skills prove second to none. It’s such fun it should be showered with special awards

There is an episode of 30 Rock in which the star of the SNL-like show-within-the-show, Jenna Maroney, gets the lead role in a planned new police procedural: Goodlooking. She solves crimes by being really good at looking at things. Lo, and not for the first time where 30 Rock’s inventions are concerned, it has come to pass. And gloriously so. Ladies and gentlemen, I give you … High Potential.

Kaitlin Olson (Hacks, It’s Always Sunny in Philadelphia, and no relation to the twins) plays Morgan, a feisty single mother of three, owner of many fantastic furry coats and a cleaner at the local police department. This includes the homicide offices, which is where she accidentally knocks a file to the ground and – as she gathers the spilled pages and photographs back together – solves the crime. She is a “good looker”, you see. I’m sorry, no. She is, we learn when the police tackle her about the untoward alterations made to their crime board by a civilian, a “high potential intellectual”. This is different from merely being clever. It means you also have great creativity, a photographic memory, obsessional tendencies and an ability to see further into brick walls than most – including grumpy police detectives.