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We are introduced to the orphans, Jack and Lucy-Ann Trent and their cockatoo, Kiki. Whilst on holiday, they befriend Philip Mannering and his sister, Dinah. Together they explore the uninhabited Island of Gloom, as a dangerous adventure awaits.

The Woods Of Adventure. Jack and Lucy-Ann explore a mysterious castle, but a sinister young man confronts them and kidnaps their beloved pet cockatoo Kiki.

The Valley Of Adventure. Philip, Dinah, Lucy-Ann and Jack find themselves flying straight into a truly amazing adventure on a visit to Scotland.

The family have come to Wellington, New Zealand for a combined holiday and business trip. They are met by Bill’s friend, another agent, called Dennis. Dennis would like Bill’s help to solve the mystery of a missing agent who is investigating the movements of the arch villain, Perez. With Bill kidnapped, the children, marooned far from the mainland, find themselves playing a dangerous game of hide-and-seek with an unknown enemy.

The holiday this time is to be in the Black Mountains. Allison is going to paint and stay at a chalet, Bill will be working, but visiting, and Hans will take the children on a pony trek for a couple of days. With the mystery of a rumbling mountain, roaming wolves, and a mad genius who plans to rule the world, the trip does not turn out as peaceful as expected.

Bill and Allison’s wedding plans are put on hold as Sir George orders Bill to drop everything and get on the trail of a villain called Slade. To cheer Allie up, the kids suggest she joins them on a cruise and they soon set sail.

In The Circus of Adventure the kids are looking forward to a summer break now school is over and are soon off on holiday with Bill and Allie. But Sir George has asked Bill to protect the future Prince of Tauri-Hessia who subsequently joins the kids on holiday. Soon the family is thrown in to a daring adventure as they are pursued by the baddies who plan to overthrow the King and place a puppet Prince Tauri-Hessia on the throne.

The family are on a river boating holiday in Turkey when Bill gets a call from Sir George. Will another holiday be ruined? Bill is instructed to gather information on a small time criminal who is linked to a larger gang and a stolen quantity of a deadly chemical.

Captured by Tel and Ivan, Jack befriends Otto and the two work together to escape and find the treasure before Tel and Ivan do. Meanwhile a panicked Allison fears for her children and Bill plans a rescue mission. But can he put it into effect in time?

The family have arrived in New Zealand. They are met by Bill's friend and colleague - Dennis who needs Bill's help to solve the mystery of a missing agent who was investigating a villain, Perez. Bill's not interested but finds himself involved anyway. Perez has his sidekick, install a tracking device on it and makes plans to insure Bill and the children pose no threat to his nefarious scheme.

Bill and the children arrive on Penguin Island. While Bill goes fishing to secure an evening meal, the children decide to explore, enthralled with the notion of living in the wild. But they don't notice the strange, wild-haired man watching them, Te Ariki, who they soon befriend. Meanwhile, Perez spies on Bill using the tracking device and sends four men to take him prisoner.

Horace Tipperlong arrives at Penguin Island in his little boat to see the penguins. But the children, suspecting he is involved with the disappearance of BiIll, steal his boat and set off to rescue Bill. Allison, having failed to reach Bill on his mobile phone, is getting very concerned and enlists the help of Dennis. But will this be enough to save the day?

The family goes to Germany. Allison is going to paint while Bill works and the children go on a pony trek with Hans. When ponies are frightened away at their camp, Hans rides off in pursuit but is knocked off the horse and lies unconscious. All their supplies were on the ponies so the children must search for food before they starve. But unbeknownst to them, there are greater dangers.

Unaware of the children's plight, Bill proposes marriage to Allison and she accepts. But her happiness is clouded as the children fail to turn up when they should. A search is impossible until morning, the mist is too thick. While wandering in the foothills, the children see Alexai being pursued by dogs. Hans is rescued but is in a coma.

After attempting to rescue Philip from the Mountain, the children try to escape and discover the anti-gravity cavern. Bill and Allison are in their car when the Mountain rumbles. When Bill sees a helicopter landing he decides to interrogate the pilot. The guards have discovered that Philip is not with Alexai and set off the alarm which places the children in enormous danger.

Bill and Allison are going on a cruise around the Channel Islands for their honeymoon. But Sir George orders Bill to drop everything in order to get on the trail of Slade - a villain. Allison is devastated. The children suggest that they go on the cruise with her instead. But when Lucy-Ann buys an Galley ship in a bottle that Slade is looking for, the children find themselves in terrible danger.

Slade arrives on the ship in disguise as a guest called Eppy with his son, Lucas, in an attempt to befriend the children. Lucas gives Jack a belated birthday present. Slade and Igor continue to try and steal the Galley and after the bottle falls to the floor and breaks, Jack discovers an old map in the ship. The children work together to try and discover where the map leads.

The children continue the search to find where the map leads, with Slade and Igor in close pursuit. After getting a message from home, Allison discovers that she has been tricked. Bill arrives at the ship and searches for clues as to the children whereabouts. In a packet of developed film he recognises Slade and quickly realises that the children are in enormous danger.

The family are going on a boating holiday in Turkey. Bill once again gets a phone call from Sir George at the last minute. But this time he is asked to find information on a small-time blundering criminal called Uma. At the hotel in Turkey they meet a boy called Oola, the badly treated assistant of a snake charmer.

After discovering Oola on board, the children invite him to stay. Bill returns with bad news - the holiday is cancelled. But the kids persuade Bill to stay another day so they can explore the sights along the river, the Temple of Dreams and the Temple of Death. The kids are shocked when they discover that the site is ruined and when the guide suddenly abandons them, leaving Jack's PC missing.

Bill and Allison have been kidnapped by Uma. After retreating into a cave, the children realize they are in the Temple of Death. They find the inner tomb of the Temple and discover the Zero One, which could threaten the world. When Uma arrives he is shocked to find the Zero One missing and sends his men after the children.

The children are looking forward to going on holiday with Bill and Allison, but Bill is instructed by Sir George to guard the future prince of Tauri-Hessia. Unknown to Bill, his car has been fitted with a tracking device by a man working for the sinister Madame Tatiosa, the wife of the Prime Minister of Tauri-Hessia, who wishes to kidnap the present king and place the puppet prince on the throne.

After stowing away in the boot of one of the cars with Kiki, Jack is taken to an airfield where he manages to hide in the cargo hold of their helicopter. Meanwhile, Bill and Allison attempt to escape from their bonds. On arrival in Tauri-Hessia, Jack and Kiki are pursued by Jones. The other children are thrown in the dungeon of Borkin Castle. Jack and Kiki makes their way to the Castle to help.

After finding his way to the Castle and discovering the heavy lock on the dungeon door, Jack leaves with the promises the others of returning with help. He returns to the circus to enlist the help of his newfound friend, Pedro. Meanwhile, the King is captured and taken to Borkin Castle. The children have once again found themselves a part of a bigger scheme and thrilling adventure.