In the novel Evil Under the Sun, Blackridge Heath is a heath in Surrey. Alice Corrigan was found murdered in Caesar's Grove on the heath.
Less than ten miles away is Marley Copse, where another woman Nellie Parsons was found murdered some time earlier. It is also within twelve miles of Whiteridge, where Stephen Lane was vicar. Also nearby is the Pine Ridge Café where Edward Corrigan had arranged to meet Alice. The nearest police station to the scene of Alice's murder is Bagshot Police Station where the murder was reported by a female hiker who found the body.