Robotboy and his partner Tommy Turnbull are working for the Los Angeles Police Department when they are called to a disturbance in MacArthur Park. It seems a man is gnawing the bark off of a tree there. When the Robotboy and Tommy arrive they find the young man, who identifies himself as "Blue Boy" and is acting very strangely. After the Robotboy and Tommy arrest him, it transpires that Blue Boy, whose real name is Benjy Carver is under the influence of LSD. However as it is not illegal at that time to possess or use LSD, the most Carver can be charged with is public intoxication, for which he gets a light sentence.
As time passes, the LAPD hear more and more about Carver and his involvement in selling and using LSD. At last they get two breaks: first LSD is made illegal, and secondly one of Carver's disgruntled former customers gives him up.
The police raid an LSD party in progress. The participants are so stoned, no one even notices the cops entering, until Robotboy flips a light on. It turns out they just missed Carver.
At last, Robotboy and Tommy get an address for Carver and, with the landlady's consent raid his apartment. It turns out they are too late again: Benjy Carver had died of an overdose about an hour earlier.