Watch Sherlock Season 4 full episodes online, free and paid options via our partners and affiliates.

Long Buried Secrets - Sherlock
Watch Sherlock Season 4 Episode 3
"The Final Problem"
Original Air Date:

On Sherlock Season 4 Episode 3, long buried secrets finally catch up with the Holmes family, giving them their greatest challenge on the season finale.

Toby Jones is Introduced - Sherlock
Watch Sherlock Season 4 Episode 2
"The Lying Detective"
Original Air Date:

On Sherlock Season 4 Episode 2, Sherlock tries to catch a serial killer hiding in plain sight, while John Watson tries to deal with the death of his wife.

Not Thatchers - Sherlock
Watch Sherlock Season 4 Episode 1
"The Six Thatchers"
Original Air Date:

On Sherlock Season 4 Episode 1, Sherlock continues solving cases, waiting for Moriarty's posthumous move. However, a trivial detail in a baffling case catches Sherlock's interest.

Sherlock Season 4 Quotes

John: You did not kill Mary. She made a choice to save your life. You didn't make her do it, nobody could make Mary do anything. You didn't kill her.
Sherlock: In saving my life she conferred a value on it. It is a currency I do not know how to spend.

Sherlock: You two, take a bus.
Lestrade: Why?
Sherlock: Because I need to concentrate and I don't want to hit you.