Be careful who you meet on vacation.

Thats just one lesson from director James WatkinsSpeak No Evil(in theater Sept. 13).

But its the films deeper themes, in addition to its heart-pounding scares, that attractedJames McAvoyto the project.

James McAvoy as Paddy in Speak No Evil

James McAvoy as Paddy in ‘Speak No Evil’.Susie Allnutt/Universal

Its Blumhouse at its best, really, the actor, 45, tellsEntertainment Weekly.

Its entertaining and scary, but its also got something at its foundation.

Its grounded in something real.

James McAvoy as Paddy in Speak No Evil

James McAvoy as Paddy in ‘Speak No Evil’.Universal Pictures

And yet he kind of makes it almost palatable."

In fact, the movies messaging about modern masculinity is part of what drew him to the role.

But what I thought was really intelligent about it was that it’s always riding a line … Universal Pictures

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Of course, all hell breaks loose.

The film explores our capability to accept, says McAvoy.

They’re digging a hole for themselves.

Thats not to say Paddy doesnt enjoy watching them dig.

He enjoys the game, says McAvoy.

That’s usually a fun thing for me to do.