Season 4 / Episode 3
Geordie is called to investigate an apparent break-in at a computer laboratory. When the head of the lab keels over and dies from mercury poisoning, Geordie suspects foul play - particularly when he finds that the Professor appears to have spent the night in the lab with someone other than his wife... Meanwhile, Will returns to Grantchester and Mrs C makes a shocking discovery.
Genre - Crime drama/Mystery/Entertainment
Running Time - 1h
Country - GBR
Language - en-GB
Original Air Date - Friday 25th January 2019
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