[portalite]

It is about a family who is trapped at a basement carpark and the water floods around them. I think there is a large and dangerous fish outside their car attacking them too.

Does anyone know the name of the book?

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I just found it. Thanks to anyone who has tried to help

It is "The Car Park" by Jan Bee Landman:
http://www.jlandman.org/horrorstorycarpark.html