Just when you thought it was safe to go back in the water, along comes Blake Lively’s lone American surfer, a great white shark and a desperate battle for survival.

Lively has travelled to a remote Mexican cove, location of her late mother’s favourite beach, little realising that it has become the shark’s feeding ground.

Their first bloody encounter leaves her stranded on a tiny rock, 200 yards from the beach – and high tide is coming.

Her attacker is between her and the shore but, as Lively’s gutsy performance makes clear, her heroine is incredibly resilient and resourceful (handily, she’s a medical student) and director Jaume Collet-Serra turns their battle into heart-stoppingly tense cinema.