There is a poisoning at a reception. The police start to think that the real target is a civil servant who forged an environmental report who also was present at the reception. Due to the forged report, the daughter of a young family is very sick in hospital. The child's father might have something to do with the death.

A jeweller is run down in the street when he crosses in a hurry. In his bag he has a collection of very valuable diamonds. The police suspect there is more to it and visit his family.

A girl with Downs Syndrome claims she knows who murdered her mother, but she doesn't want to say who it is. She only trusts the professor. Lisa is worried about her father and Dan has a surprise when he turns up for their date.