The murder of Mona Tinsley is a British child murder case from 1937. On 5 January 1937, 10-year-old Mona Lilian Tinsley disappeared after leaving her Newark-on-Trent school. A former lodger of Mona's parents, Frederick Nodder, became the prime suspect in her abduction. However, despite the fact both strong physical and circumstantial evidence existed attesting to his guilt, because no body could be found, Nodder could not be tried for her murder, but was instead convicted of Mona's abduction and sentenced to seven years in gaol.