Josie Long presents stories of investigations - both amateur and professional.
The comedian Alex Edelman describes his search for a missing cult legend, a German historian talks about the trouble of tracking down Hitler's head and a group of young mothers gather together to solve the mystery of disappearing teething powder.
Series Producer: Eleanor McDowall
A Falling Tree production for BBC Radio 4
The items featured in this programme are:
Maria
Produced by Martin Johnson
Hitler or Bust
Produced by Rose de Larrabeiti
Teething Problems
Produced by Luke Eldridge
Finding Joe Hammond
Featuring Alex Edelman
Produced by Sophie Black.
