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Masterful crime series

The Killing

Channel 4, 9pm

Sarah (left, Mireille Enos) seems to have made a breakthrough in the Rosie Larsen case, discovering the victim may have been to a casino on the night of her disappearance.

However, she takes the wrong approach with some rough types at the gambling den and is shown the door.

Matters take yet another sinister twist when her son, Jack, disappears.