Johnny O'Brien

Nick Hardcastle

Fifteen-year-old Jack is sent to 1914 Europe as a pawn in the battle between his long-lost father, who has built a time machine, and a secret network of scientists who want to prevent him from trying to use it to change history for the better. Includes historical notes.

A Jack Christie Adventure

Day of the Assassins

Arthur Conan Doyle, Sir

Sue Parminter

Since her father disappeared, she has received a large pearl through the post on the same day, every year, for six years. Who is sending them? And what about her father's paper with the words 'The Sign of Four' written on it? Sherlock Holmes alone can solve these mysteries.

Nick Hardcastle

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