Dens of Iniquity II - Celestial Synapse

 two children died in the ranch
swimming pool and a fire broke out which destroyed the Burdell mansion

 5th child was killed - someone laced food prepared for 400+ people, with drugs, @ Harbinger, the following day, Feb. 20/69. Very nasty way to destroy a conference, a commune, a family, hopes and functions.

 (Maybe you've heard of 12 - 54 (3 days of the condor and such))