TV tonight: David Mitchell solves a murder in the new comedy Ludwig | Television

Louis

9pm, BBC One
A fun comedy-drama from Mark Brotherhood (Mount Pleasant, Benidorm) about a reclusive and socially inept mystery solver, John “Ludwig” Taylor (David Mitchell, doing his trademark juvenile thing). John is asked to impersonate his identical twin brother, a detective named James, after he goes missing. When James' wife Lucy (Anna Maxwell Martin) asks John to collect some documents from James' station, the inevitable happens: John has to investigate a murder case. Phil Harrison

999: On the front line

8pm, Channel 4
The West Midlands Ambulance Service continues to deal with impossible demands, including a man who stopped breathing outside a nightclub and a patient suffering from sickle cell anaemia, requiring paramedics to perform superhumanly well to care for these patients. Jack Seale

The Chelsea Detective

8pm, U&Drama
More drama from the dark side of one of London's chicest neighborhoods. In the first part of a double episode, a murdered security guard may have been the victim of a drug deal gone wrong. But then Detectives Max and Priya learn that he wasn't as innocent as he seemed. Hollie Richardson

parole

9pm, BBC Two
An in-depth look at the path that violent prisoners take to rejoining society. First, we meet Martin, who murdered a friend with a table leg, and the parole board that will decide his fate. Their process, says one, involves asking: “Would I be concerned if this person moved in next door to my mother?” PH

Great designs

9pm, Channel 4

Converting a coastguard station on a prominent Yorkshire headland into a comfortable home, on a tight deadline and on a tight budget – what could go wrong? Kevin McCloud's property show returns with a tricky project where Zahid and Ferzana seem to have taken on too much. PH

In search of Satoshi: The mysterious disappearance of the Bitcoin inventor

21:15, U&W
Who is Satoshi Nakamoto? Is he even a person? The title of this documentary is intriguing, but it's also a red herring – the show serves as a convenient, simplified explanation of cryptocurrency, how it works, and why it might gain traction. As for Nakamoto, the mystery remains largely intact. PH

Live sports

English League Cup Football: Liverpool vs West Ham 7pm, Sky Sports main event. A third round match at Anfield.