Unknown (12) * * *

Joaquin Phoenix and Rooney Mara in Mary Magdalene.

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Unknown wraps a simple premise in layers of deceit, hoping to convince us that Oliver Cornwell and Stephen Cornwell’s script, adapted from Didier Van Cauwelaert’s novel Out Of My Head, is a tricky conundrum with a delicious sting in the tail.

Audiences will probably guess the twist well before director Collet-Serra pulls that narrative ace from his sleeve, but it’s of little consequence because he punctuates the intrigue with some well orchestrated set pieces.

Dr Martin Harris (Liam Neeson) travels to Berlin with his wife Elizabeth (January Jones) to attend a biotech conference.

As they arrive at the hotel, Martin realises he has left a briefcase at the airport and he jumps into a taxi to collect it.

En route, there is a freak accident and Martin slips into a coma, waking four days later in hospital with fractured memories.

Discharging himself from hospital, he races back to the hotel and is delighted to find his wife... except Liz doesn’t recognise him and another man (Aidan Quinn) with the same name is on her arm.

An entertaining mystery.