Conor and his family live on the sovereign Saltee Islands, off the Irish coast, which are ruled by King Nicholas Trudeau.

When a dangerous fire traps young Conor and his friend Isabella (the king's daughter) on top of a tower's roof, he saves both their lives by making a makeshift glider to fly them to safety.

Marshall Hugo Bonvilain, the head of the island's guards, conspires to overthrow Nicholas and seize control of the Saltees.

Before long, Conor begins to make deals with a guard named Arthur Billtoe and gangsters called the Battering Rams.

Conor and Otto Malarkey, a Battering Ram, smuggle seven bags of diamonds and hide them in the gardens.

Unbeknownst to Billtoe, Conor is using these materials to plan a grand escape during the coronation of Isabella, now old enough to become Queen of the Saltees.

Linus learns that Bonvilain intends to overthrow the monarchy again by poisoning Isabella and her greatest supporters, Conor's mother and father.

She has reduced taxes and intends to free the prisoners and hand Little Saltee over to a professional mining firm.

Conor is ready to leave for Glasgow University to study for a science degree and kisses Isabella.

The Forlorn Tower is in the good hands of "Uncle" (a street boy Conor befriended) and two of his pack.

It was set to be directed by Gil Kenan and produced by Robert Zemeckis through his joint venture with Walt Disney Pictures, ImageMovers Digital.