I just remembered this book today, after not thinking about it in years. I read it when I was kind of obsessed with suicide.
This book is the novelization of a made for TV movie. As I was trying to find information on this book, I found out that the movie aired on ABC in 1985. It starred Molly Ringwald and Zach Galligan as the suicidal teenagers. Apparently River Phoenix was in the movie too. Strangely, I have never seen the movie (re-released in 1993 on VHS and renamed Tragedy), but I am pretty sure I read the book more than once.
UPDATE: Oh yeah, now that I see this cover, I know that I owned this book and read it multiple times.
(disclaimer, I haven't watched the movie so there may be a plot detail/nuance I'm missing)
I know we're not supposed to think of suicide as a punishment/revenge tactic, but seeing the parents in here act like they didn't even like their kids, even by 1980s teen movie standards, I'm just sitting here thinking 'yeah, serves you right, you a-holes. I'm only feeling sorry for the siblings and pets'.
This novelization of a 1984 ABC TV movie... well, that's all you need to hear, right? That's totally why I read it, and it was all I could have hoped for. It is very eighties, yet way better than you'd expect. Trying to get ahold of the movie (starring Molly Ringwald!) now. About a teen suicide pact that is carried out, and the aftereffects on their families.