'Servant' season 4 starts streaming January 13 — here's how to watch M. Night Shyamalan's critically acclaimed horror series

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• The fourth season of "Servant" hits Apple TV Plus on January 13.
• The psychological thriller comes from the mind of M. Night Shyamalan.
• To watch "Servant," all you need is an Apple TV Plus subscription ($7/month).

M. Night Shyamalan's psychological horror series, "Servant," is coming back for a new season on Apple TV Plus. The fourth season premieres on January 13, and new episodes will be released weekly every Friday.

The series follows Dorothy and Sean Turner, a wealthy married couple working through their rocky relationship after a tragedy befalls them. They hire a nanny named Leanne to take care of their infant son, who is actually a lifelike doll that Dorothy uses to cope with the loss of a real baby. As both Turners deal with their grief in different ways, their tense marriage undergoes even more stress, and the suspicious nanny they invited into their home isn't helping. 

Check out the 'Servant' season 4 trailer

Season four promises more thrills than ever, with Leanne's unnatural abilities threatening more than just the family. The cast includes Lauren Ambrose, Toby Kebbell, Nell Tiger Free, and Rupert Grint.

How to watch 'Servant'

You can watch "Servant" exclusively on Apple TV Plus. The fourth season premieres on January 13, and new episodes will debut every Friday through March 17. Subscribers can also catch up on the first three seasons right now.

Apple TV plus costs $7 a month. After subscribing, you can stream the service from any web browser or the Apple TV app. The app is available on pretty much any smart device you can think of, including most smart TVs, streaming sticks, and gaming consoles from major brands. Check Apple's site for a full list of supported devices.

Can I watch 'Servant' for free?

You can watch "Servant" for free if you sign up for an Apple TV Plus free trial. The service offers seven days free for new subscribers. Even better, new Apple device owners can tap into three full months of the service, free of charge, and Best Buy also has a special three-month offer. 

To watch the entire fourth season of "Servant" for free, you should wait to sign up for your trial until the final airs on March 17.

How many episodes are in 'Servant' season 4?

Season four of "Servant" will have 10 episodes. New episodes are set to be released weekly, just like prior seasons. 

Will there be a 'Servant' season 5?

Season four is being billed as the show's final season, so there will not be a fifth season of "Servant." 

Is 'Servant' worth watching?

As of January 12, "Servant" has an overall rating of "91% Fresh" on Rotten Tomatoes. Early reviews for season four are positive, with a "100% Fresh" rating based on seven reviews.

"Servant" is especially worth watching for fans of horror icon M. Night Shyamalan, who serves as an executive producer and one of the directors for the series.