This is the third of these nakedly vulnerable, strafing accounts of a parent's inability to salvage a son on drugs (Milton Travers' Each Other's Victims, 1970; Ellen Russell's The Last Fix, 1971) who ultimately became -- as he might have anyway -- schizophrenic. Chapin, a San Francisco Chronicle columnist, does not hesitate to visit the sins of the father and appropriates to some extent throughout guilt for what happened although he is still unsure of how else he might have handled Mark who graduated in no time at all from marijuana to LSD to speed. At first there were private psychiatrists -- even a possibly therapeutic $1200 set of drums. Before long Mark was in and out of Synanon and Napa State and Mendocino's ""Family"" and perhaps what is most discouraging here is the professional inability to handle him and reluctance to retain him. Now he's permanently (?) institutionalized. All of it however familiar, however hopeless, is lacerating and narrows the margin between witness and participation.