A historical mystery with a compelling locked-room puzzle at its centre, featuring an odd-couple detective combo, continuing the Frey and McGray series.

Oscar de Muriel was born in Mexico City where he began writing stories aged seven, and later came to the UK to complete a PhD in Chemistry. Whilst working as a translator and playing the violin, the idea for a spooky whodunnit series came to him and Nine-Nails McGray was born. Oscar has now written four Frey and McGray titles and splits his time between Manchester and Mexico City.