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The friends solve the last of the cipher, open the hidden chamber, and uncover the secret Ebenezer Crowther hid for 250 years.

The 250th celebration goes ahead. The capsule is opened, the lost names are read aloud, and the light is re-dedicated for the next 250 years.

Ten years after saving the Wanderlight, the six friends return to Merhaven for the lighthouse's 250th anniversary — and find a mystery waiting in the stones.

The 1785 time capsule, sealed to be opened at the 250th celebration, is missing from the lighthouse foundation. The investigation begins.

Soraya uncovers a cipher left by Ebenezer Crowther — a puzzle the builder designed for the 250th anniversary. But a rival historian is hunting the same prize.

Suspects multiply as the friends race to decode the cipher. A threatening note warns them to stop — and the celebration preparations are threatened.

The first cipher clue sends the friends across Merhaven's oldest landmarks. But someone is sabotaging the anniversary preparations to drive them off the trail.

Deeper in the archive, Soraya discovers the true story of the shipwreck — and a list of names lost for two and a half centuries.

The celebration is sabotaged overnight. Tomas turns his digital skills to finding who is behind the campaign of intimidation.

An old witness comes forward with a fragment of the past. The cipher yields another clue — and the friends close in on the capsule's hiding place.

A public confrontation exposes the rival's true motives. The final cipher clue falls into place — and points to the lighthouse itself.

A betrayal from within threatens everything. A storm proves the lighthouse's worth once more, and the friends find the capsule's resting place.