Collecting Tomes 1 and 2 in English!
From the back cover:
Filled with con men and scoundrels, London's East End is not easily survived alone. Fortunately, the three friends - and their faithful feline companion - can count on the protection of Sherlock Holmes, for whom they sometimes act as spies.
When Tom's girlfriend is kidnapped, the Baker Street Irregulars must put their budding sleuthing skills to use. Then, when a Russian immigrant is framed for a Jack the Ripper - inspired crime, our heroes set out to discover the truth and uncover a conspiracy that may go deeper than they ever imagined.
Armed with only their quick wit and street smarts, the Baker Street Irregulars must work together to solve mysteries in the nick of time. Make way for the youngest detective team of the Victorian era!