Detective Inspector Costello has resigned. No notice, no goodbyes. Convinced that George Haggerty murdered his wife and son despite his cast-iron alibi, Costello has gone solo, determined to expose a ruthless killer without being hampered by police protocol. But is she right about Haggerty's guilt? And where has she disappeared to? DCI Colin Anderson has no time to ponder the loss of his partner of twenty years. With a badly beaten body found on a remote mountain pass; a woman with a serio...

Glasgow's citizens are in celebratory mood for the annual West End Festival parade. But beneath the jovial surface lurks something darker. A confused young woman is found wandering among the stilt-walkers and jostling crowds, claiming to have been abducted by aliens. Before DCI Anderson and DI Costello can investigate further, a body is discovered and it becomes horrifyingly clear that a depraved killer has taken advantage of the busiest day of the year to carry out a gruesomely macabre pl...

In August 1992, a young mother and her two small sons were brutally murdered in the woods behind their home. Her neighbour, Andrew Gyle, was convicted of the crime and sentenced to life imprisonment. Now, twenty-three years later, a macabre discovery throws new light on the case. Could there have been a shocking miscarriage of justice? DCI Colin Anderson and his partner, DI Costello, uncover serious discrepancies in the original investigation; it becomes clear that not everyone is telling ...

When a six-week-old baby is stolen from outside a village shop, Detective Inspector Costello quickly surmises there's more to this case than meets the eye. As she questions those involved, she uncovers evidence that this was no impulsive act as the police initially assumed, but something cold, logical, meticulously planned. Who has taken Baby Sholto, and why? Colin Anderson meanwhile is on the Cold Case Unit, reviewing the unsolved rape of a young mother back in 1996. Convinced this wasn't...

A few days before the summer solstice, a 92 year old woman is found burned to death in her home. On the same day, a man's mutilated corpse is discovered, his arms ripped from their sockets, with a Tarot card depicting ‘The Fool’ inserted in his mouth. When the victim is identified as someone for whom the police have been looking for almost a year, detectives Anderson and Costello find themselves caught up in a case where nothing is as it seems.

It's Christmas, and half the Partickhill police squad is down with flu. Not good timing, with a series of cyanide poisonings in the area, plus two small boys reported missing in the space of a few days. And then there's the monumental task of providing concert security for rock legend Rogan O'Neill... But for Detective Inspector Colin Anderson, the nightmare is about to get terrifyingly close to home. For a third boy has now gone missing - Colin's own son, Peter. The team race to find the ...

Elvie McCulloch’s sister Sophie has been missing for 57 days. She went out for a run – and never came home. Several young women in the area have disappeared in similar circumstances and Elvie’s family fears the worst. Teaming up with retired detective Billy Hopkirk, Elvie determines to find out the truth. But as the pair alternately collaborate with and infuriate investigating police detectives Anderson and Costello, they find themselves up against a terrifying enemy. Someone they call ‘Th...