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But the truth was detectives had, finally, cracked a cold case that had lingered unsolved on the books of Cheshire Police for 25 years.

Aaron has also collated a list of more than 100 unsolved killings.

As a crime fiction fan, Ritter has a sweet tooth for the unsolved and seemingly unsolvable mystery, perpetrated by a criminal who is also a shape-shifter of sorts.

The intelligence sharing system can lead to a person arrested for one crime being linked to numerous unsolved crimes.

Strathclyde Police launched Operation Anagram, a nationwide scoping exercise which tried to establish whether Tobin could be linked to unsolved cases around the UK.