Looking for a book with Walter in the title

[Bec]

I read it ages ago probably from 2017-2019 it was a teen book about a school who somehow get lost and spend a night in an old apartment building by waiting for a new bus and they find this book about someone called Walter and his life

[RabbitMilitia]

His Name Was Walter? (Ha! That's my name...)

[Lobstergirl, au gratin]

Bec, if you know plot details they must be in your topic header. Genre must be there too.

[bookel]

Bec, could you please edit so that the query makes grammatical sense? A school that gets lost?!

[bookel]

Could it be this book, found on worldcat.org by searching Walter in the title and a year range 2015-2019.

His name was Walter
Author:Emily Rodda (Author)
Summary:'Once upon a time, in a dark city far away, there lived a boy called Walter, who had nothing but his name to call his own . . .' The handwritten book, with its strangely vivid illustrations, has been hidden in the old house for a long, long time. Tonight, four kids and their teacher will find it. Tonight, at last, the haunting story of Walter and the mysterious, tragic girl called Sparrow will be read - right to the very end ... An extraordinary story within a story -- a mystery, a prophecy, a long-buried secret. And five people who will remember this night as long as they live
Print Book, English, 2018
Publisher: Angus & Robertson, Sydney, N.S.W., 2018