This isn’t a particularly chancy film, unless the decision to go old school is considered such. It is still, however, quite good.

Increasingly tense and benefiting from a well-thought-out script by Tony Gilroy, it finds a slim opening for heroics in a place where all parties are tainted.

Hamm’s bleary but still debonair presence, Gilroy’s cynically witty dialogue, and the not-quite-confusingly-large array of colorful characters underline how Beirut aims to be less a statement about Middle Eastern strife than a good yarn propelled by the unpredictable currents of international politics.

In Beirut, Hamm still doesn’t have the outsize personality we associate with major movie stars — a lot of whom are lesser actors. But he has focus. He can think onscreen. He can make you watch him closely, trying to keep up with the wheels churning in his head. I think he has fully arrived on the big screen.

Beirut contains all the elements of a fun, snappy, pre-summer jaunt. And yet the film is actively in competition with itself. The tone is grim and honest when it wants to be, but not necessarily when it needs to be.