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48 pages, Paperback
First published October 31, 1991
Witness to a dramatic kidnap, Mel is plunged into a twilight world of gangsters and secret agents. A coded message leads her down into the sewers and subways, and up to the glitzy heights of Megabuck Towers in a bid to foil a sinster plot to take over the world.
Each book in this exciting series combines a gripping adventure story with fiendishly difficult puzzles. There are clues and answers at the back of each book. If you don't need to look at them you well be a genius.
Titles in this series
Standard Level
1 ESCAPE FROM BLOODCASTLE
2 The Curse of the Lost Idol
3 Murder on the Midnight Plane
4 The Incredible Dinosaur Expedition
5 The Intergalactic Bus Trip
6 Time Train To Ancient Rome
7 Danger at Demons Cove
8 Agent Arthur's Jungle Journey
9 Agent Arthur on the Stormy Seas
10 The Ghost in the Mirror
11 The Haunted Tower
12 Agent Arthur's Arctic Adventure
13 The Vanishing Village
14 Search for the Sunken City
15 Journey to the Lost Temple
16 The Pyramid Plot
17 The Invisible Spy
18 The Emerald Conspiracy
Advanced Level
1 Codename Quicksilver: Advanced Level
2 Cobra Consignment
3 Murder on Main Street (I can't find this, or even an ISBN, sadly)