The Happy Thistle.

When probationary police officer, Heather Prendergast, is enlisted by her estranged father to secure the returned of her kidnapped stepsister, she is faced with the most baffling case of her short career – and her most deadly foe.
Beyond the swing doors of The Happy Thistle Restaurant lurks a sinister secret - the Highland themed eatery is a front for a mad professor hell-bent on world domination. Half way through constructing a domestic nuclear fission laboratory in the basement, his bitcoin reserves run dry leaving him with no alternative but to borrow up to and beyond the hilt from notorious loan sharks, The Proust Mob, pledging four nuclear centrifuges and a domestic hadron collider as security. When the Prousts demand their money back with three hundred percent interest, he instructs his kilted chef, Groaty McTavish, to kidnap the daughter of a billionaire banker. Simple, I hear you say . . . or maybe not. To put it mildly, the best laid plans of mice and men gang aft agley. All is revealed in The Happy Thistle – The Curious Case of the Katenapped Girl.
Cover illustration by Amelie Ahern-Williams