Roberts and Bradley Casebook Series by Solomon Carter

Teenagers frolic in the darkness - but their sinister acts are no game. Private detectives Eva Roberts and Dan Bradley are hired to investigate cult activity at an ancient ruin.Blood is spilled. Lives are ruined. And for one young girl, it's a matter of life or death. But the darkness hides the awful truth.The investigators must discover who they can trust stop the cult from harming all those it touches. First they must survive the night - and one of its darkest sons...