YA, SCI Fi: earth destroyed by laser beams from alien ships, a child one of the few human survivors 1970s or 80s

[Fleurtje Eliza]

Hi there,

As a kid, near the end of the 1980s, I read a book that was impressive, but I still managed to forget the title of it :)
Around the same time I read Momo and The Satanic Mill, so I am guessing this book I'm looking for is from the 1970s or 80s.

Space ships flew over the earth killing everything with their laser beams, but a child that was in the water (a pond, lake, swimming pool?) was unharmed. When he/she/they resurfaced it appeared everyone else was gone and goes to look for other survivors.
I remember that after a while he/she/they stumbled upon a banner (sheet?) hanging somewhere outside a building announcing other people still alive, not sure what happened after that... It seems aliens were no part of the story, the book was more about the journey of the teenager.

So far no luck with several search engines, not even with the new Talpa.ai so hopefully someone here can help me out?

Thanks! Ciao, Fleur

[SBC]

Hi Fleur, it doesn't ring a bell for me but sounds interesting! Have you had a chance to check the Last Humans list? https://www.goodreads.com/list/show/1...

[Fleurtje Eliza]

Thank you SBC, that looks like a helpful suggestion! I'll go check it later :)

[Rainbowheart]

Does anything on the 20th Century YA and Middle Grade Science Fiction list look familiar?

[Fleurtje Eliza]

Thank you, Rainbowheart! Fingers crossed I'm gonna find it :) Of course, if I do, I'll let y'all know.

[Rainbowheart]

Fingers crossed!