In the first novel about Cabal there's a dialogue between Johannes and Horst that suggests that both their parents are dead. Then in Brothers Cabal Horst thinks about visiting his mother in Hesse, but is affraid of "puting her in her grave with shock". That suggests that she is alive (for one can't give a heart attack to a dead person). Does this mean that Mrs Cabal has her part to play in some future novel or story?