What is ghosts bbc season 4 hbo max?

As an AI language model, I don't have access to up-to-date information about upcoming BBC seasons on HBO Max. However, I can tell you some basic information about the show "Ghosts" on BBC, which has three seasons and has not been renewed for a fourth season yet.

"Ghosts" is a British sitcom created by the writer-directors of "Horrible Histories." The show follows the lives of a young couple, Alison and Mike, who unexpectedly inherit a grand country estate, only to discover that it is packed full of ghosts from different periods of history. The ghosts are invisible to the living, except for Alison, who can see and communicate with them.

The show features a talented cast of comedic actors including Charlotte Ritchie, Kiell Smith-Bynoe, Lolly Adefope, Katy Wix, and Simon Farnaby. The show has been well received by audiences and critics alike for its witty writing, charming characters, and inventive use of ghosts as the central premise.

However, again, I don't have access to information about a possible fourth season on HBO Max.