Follows the adventures of Agent Arthur and his dog Sleuth as they try to capture the evil Squid Squad, and includes clues and puzzles to help readers assist with Arthur's investigation.

Agent Arthur needs to solve the puzzles to sabotage the devious Squid Squad's scheme.

These stories of adventure and mystery are interwoven with puzzles to solve, extra clues and answers are at the back.

Arthur's second mission for the Action Agency takes him into blood-freezing danger. He'll need your assistance if he's to outwit the chilling plans of the sinister Spider Organization. Help him solve another collection of brain-bending puzzles to save the day. Another Usborne classic is given a new lease of life for the 21st century.