Hari at the Beach is the latest book in the Hari's World child safety series, and will be hitting retail in early October.
Two Hari's World titles are already available and are selling strongly through branches of Waterstones and the company's website.
Subtle safety messages are woven into each adventure to teach children about how to avoid unintended injury.
The new 32-page book follows the character during a day at the seaside.
Ten books are planned initially, with two new characters introduced in each adventure.
"Hari on the Beach is a wonderful book and I'm sure that it will prove to be just as popular as the first two titles in the series," said Tristan-Sean McGee, MD at Hari's World. "The publication will also have an impact in licensing terms and add to the excitement surrounding Hari. We are already dealing with significant interest from potential partners across the board and this will undoubtedly increase after the new book hits the shelves."