Mystery Team seems like a great 4-minute sketch–three intrepid kid detectives grow up but never grow out of their roles. Smack ’em down among your typical foul-mouthed contemporaries, play up their naivete against risque shenanigans. And you can imagine this great sketch going horribly wrong at feature-length — fading into a coma from fatal whimsy, or yukking it up with the yucky yuks. But MT manages to have its chocolate milk and drink it, too. Despite the occasional twee or arch bit, despite a willingness to sink their hands deep into the muck (and to dig out some great laughs), this is a character-driven comedy — and about as idiosyncratic and winning as I’ve seen in some time. The first 20 minutes drag — it seemed like that high-concept sketch — but as the characters develop, the cast gets increasingly good at selling strange jokes, and the film delights in unforced delivery of very funny lines.