After the mysterious death of wealthy old Everard Hope (Eliot Makeham), his avaricious relatives are little pleased to discover that his estate has been left to distant relation Dorothea Capper (Jessie Matthews), a young showgirl. The one condition of the will is that she must stay in Hope's spooky mansion for a month. After several attempts on Dorothea's life, detective William Gardener (John Stuart) decides to investigate.