Weggeloopen!
/"Weggeloopen!" was published in 1919 – a story about a mischievous boy named Paul, who frequently disobeys his parents and often gets into trouble. The illustrator was Cecil Aldin – a British artist and illustrator. The book contains many of his drawings which depict the time in the first decades of the 1900s. It is available from Project Gutenberg.
There are quite a few books illustrated by Cecil Aldin available on Internet Archive, but this is the only one not in English! Because of the publication date, I wondered if the illustrations for this book were done after his only son died in World War I in 1916.