The Shallows review - a thriller with teeth

A young woman gets stranded on a rock in the ocean, oh and there’s a shark.

So The Shallows is a movie about an improbably burnished Blake Lively (seriously, she looks like she’s carved from mahogany) going to an isolated beach to get away from it all. She surfs a bit and is promptly stranded on a tiny hunk of rock with a killer shark circling.

That’s pretty much it when it comes to set-up, kicking off a breathless thriller that’s as effective as it is patently ridiculous.