The Hidden Harbour - Full Adventure

A real letter. A new piece of the adventure. Every two weeks.

Letter Folk is a year-long mystery adventure delivered through the post.

Every two weeks, your child receives a real letter from Kai, a boy whose ordinary harbour becomes the centre of an extraordinary mystery.

After a wild storm, Kai and his dog Benny uncover a smooth silver cube buried in the sand. It has no markings, no obvious purpose, and no reason to be there.

But strange things begin happening the moment Kai and his friends start investigating.

Soon Kai, Benny, Zara, Ava and Ethan find themselves following clues, uncovering secrets and discovering that someone is trying very hard to keep the truth hidden.

Each letter continues the story exactly where the last one ended, creating a year-long adventure that arrives directly in the mailbox.

Included in the Full Adventure

✓ 24 physical story letters

✓ Delivered across 12 months

✓ One new letter every two weeks

✓ Complete Hidden Harbour mystery

✓ Over 200 pages long

✓ Addressed directly to the child

✓ Australian postage included

✓ No ongoing billing

Suitable For

Curious readers aged 7–15.

Perfect for children who enjoy mystery, adventure, exploration, puzzles and stories that unfold over time.

Best For Gifts

The Full Adventure is our most popular option for parents and grandparents.

One payment covers the entire 12-month journey, with no ongoing subscription and no future billing.

Save $69.45 compared with paying monthly.

Three Letters Promise

If your child or grandchild isn't excited about receiving the next letter after reading the first three, simply let us know and we'll refund your purchase.

The First Mystery

After the worst storm Kai has ever seen, Benny digs a smooth silver cube from the sand. It has no markings. No scratches. No obvious reason to exist.

Soon Kai, Zara, Ava and Ethan discover a hidden staircase beneath the lighthouse and a doorway into another version of their harbour. A place where the sea is too still. The shops are too perfect.

And someone known only as The Jeweller is determined to stop them discovering the truth.