Renée Soutendijk was a very popular actress in The Netherlands and Belgium, where I grew up during the 80s and early 90s, and a beloved sex-symbol thanks to her roles in local cult-classics like "Spetters" and "De Vierde Man". At the end of the 80s, she aspired an international career, but it was over very quickly, and I still don't fully understand why, because the few movies she made in the US were interesting; like this "Grave Secrets" and the Sci-Fi thriller "Eve of Destruction". She's a good actress, and her English is almost completely accent-free, which can't be said from most Dutch performers trying their luck in Hollywood.
That being said, "Grave Secrets" is a sorely lacking and disappointing horror. Especially for being produced in the late 80s, the film doesn't nearly deliver enough in the gore and sleaze department, and this despite numerous shocking & controversial themes in the plot (incest, rape, baby murder, ...). The main and obvious problem is that all the good stuff is saved up until the final 10-15 minutes. The first 70 minutes are far too dull, vague, and bloodless. The most exhilarating thing happening for a long time is a ghostly force throwing a raw egg in the face of paranormal investigator Paul Le Mat, go figure! The climax is fun, with a glorious over-the-top role for stunt man Bob Herron, but it comes too little too late to fix everything.