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Retired police detective David Swindle investigates the deaths of two young Scots killed abroad.

In May 2012, 26-year-old Craig Mallon, from Coatbridge, North Lanarkshire, travelled to Lloret de Mar in Spain for his brother's stag weekend. Within a few hours of arrival he was killed by a single punch to the head. Six years later, the Spanish police have still not been able to identify his killer.

In April 2017, 27-year-old Kirsty Maxwell, from Livingston, West Lothian, arrived in the Spanish town of Benidorm for her friend's hen party. Having returned home from their first night out, all the women fell asleep - but Kirsty awoke and left her room. She ended up in a tenth-floor appartment with five men from Nottingham whom she did not know. It was from a window in this appartment that she fell to her death. The men denied all responsibility for her death.

Stricken by grief and feeling abandoned by the authorities, both in Spain and at home, the families of Craig and Kirsty are desperate for answers. Drawing on his 34 years of police experience, across hundreds of murder enquiries, David sets out to discover the truth of what really happened to Craig Mallon and Kirsty Maxwell.