How many James McAvoys does it take to change a lightbulb? If the answer is 23 or less, then the actor’s character Kevin should be just fine illumination-wise in Sixth Sense writer-director M. Night Shyamalan’s new horror film, Split (out Jan. 20). Why? Because Kevin suffers from dissociative identity disorder and 23 is the number of personalities he has evidenced to his psychiatrist (Betty Buckley), whose mental ministrations do not prevent Kevin kidnapping three teenage girls, including one played by The Witch‘s Anya Taylor-Joy.

Will the trio succeed in escaping? Or is everyone really a ghost? You can find out when the film is released Jan. 20. For now, watch the film’s new trailer above.