Just as Sir Arthur Conan Doyle's The Parasite does, May Sinclair's novella The Flaw in the Crystal shows how dangerous playing around with occult forces can be for everyone involved. It is not just evil witches such as Helen Penclosa who end up in big trouble: after Agatha Verrall heals two of her friends using a pschic gift that she doesn't fully understand, things start to get unbalanced and out of control. She soon finds herself in a horrible mess of her own making.
May Sinclair gives a very detailed account of what happens next; she also has a lot to say about the Power that operates through Agatha. It is quite a challenge to identify the key points!
The regression of Rodney Lanyon
Agatha Verrall does not see her friend Rodney Lanyon for some weeks. She hears from him that his wife Bella is still well, so she assumes that he is too because he was only ever ill because of Bella.
Agatha has been using her gift to keep him away; she has removed his strong inclination for her company. This is another unwise decision: she now feels a longing for his company! Something similar to the conservation of energy is involved here: the feelings that she took away from Rodney are now hers.
These feelings become so persistent amd so unbearable that she cuts the thread that connects her to Rodney. She hears from him again: Bella is still well, but he has has gone back to where he was before Agatha started to heal him:
“She might have known it. She had in fact known. Having once held him, and having healed him, she had no right—as long as the Power consented to work through her—she had no right to let him go.“
But what right did she have to hang on to him?