The 3rd book in the '60s/'70s trilogy of novelisations of the cult TV show, this was better than the 2nd offering by McDaniel, but the 1st novel by Disch stands head-and-shoulders taller.
This installment by Stine (now Jean Marie, not Hank 💖🏳️⚧️💖) had some mischaracterisations, & focused somewhat on contemporary hippie/square generational conflict, but overall was a worthwhile read. If you're not a super-fan of the show, I'd stick to the Disch