Unwin and the Manual's author, Edwin Moore, join forces to try and solve the mystery, but the whole city is sleepwalking, and the only possible explanation lies deep in the Agency archives. Read by Toby Jones.

Somewhere in an unnamed, rainy city, Charles Unwin, a lowly but efficient clerk in a big detective agency, has found his world turned upside down when his detective boss, Travis Sivart, disappears.

Suddenly promoted to the role - Unwin's been forced out into the field for the first time in his life. Unprepared and untrained, armed only with his trusty umbrella and The Manual of Detection. His first mission is to find out what happened to his boss.

Abridged by Eileen Horne
Produced by Clive Brill

Made for BBC Radio 4 Extra by Pacificus Productions. Show less