I don’t think Evil of Frankenstein deserves quite as much venom as is sometimes flung its way. It’s a misstep, sure, and a disappointing experiment, sort of like one of the doctor’s many unsuccessful attempts at breathing life into the dead.
Paul investigates and discovers that all of them were clients of Christine. There’s also the body of a poor sewer man with no dialogue other than “Aarrgghh,” played Michael Ripper.
Lee is less of a presence here than in the last film, and his shadow doesn’t seem to loom as powerfully over everything when he’s not present as it did in Prince of Darkness. But when he does show up, he looks exquisite.