Leah Bishop accepts a transfer to a branch of Interpol in Glasgow, Scotland, where she discovers her fellow officers are monsters from Scottish folklore.

Detective Inspectors Leah Bishop and Dorian Grey interrogate a baobhan sith vampire and a time-travelling Scottish Highlander makes a new friend.

Detective Inspector Leah Bishop discovers there is more to the selkie charm than beauty, and a merman gives them new leads on the case.

Detective Inspector Leah Bishop meets Aonghais, one of the Faerie. Dylan and Tearlach discover that there is more to Dylan than meets the eye.

Leah learns more about Dorian's past, and the danger of working with monsters. Aonghais and Dylan work together for the first time.

Leah and the selkies learn something about Geoffrey.

Leah and Dorian pay a visit to Milo, learning more about faeries and the nature of mermen.

Leah and Dorian learn a secret Magnus has kept for years.

Leah and Dorian investigate a new case.

The Selkie King reaches a decision about Magnus.

Detective Inspector Leah Bishop discovers a world of magic and murder as the first human recruit to the Scottish branch of the supernatural Interpol.