There have been a number of similar shows on UK TV recently; odd-couple detective teams e.g. The Chelsea Detective, Murder in Provence, McDonald & Dodds. Fabulous for me as they are right in my wheelhouse and this one delivers.
Harry (Jane Seymour) is self-confident, mouthy with few social filters and, as a recently retired English Professor, offers unwelcome grammatical corrections during conversations. She has a detective son Charlie (Kevin Ryan) whose life she generally makes a misery by interfering with his cases - usually by solving them! Her partner-in-crime is Fergus (Rohan Nedd) who is an articulate, street-wise teenager from a poor background. Indeed they first meet during a mugging perpetrated by Fergus on Harry! Their relationship works well and they develop a growing mutual admiration as their complementary skills help them solve cases.
Easily-digestible, enjoyable viewing - believable core characters - interesting stories flying above the mere procedural.