A lost seal. A hidden cult. A secret buried beneath Roman Londinium.

When twelve-year-old Marcus Crispus discovers a mysterious bronze seal in the bustling streets of Roman Londinium, he has no idea he's just stepped into the centre of a deadly conspiracy. Powerful men want the seal back - and they'll stop at nothing to silence anyone who knows the truth.

With the help of his sharp-witted friend Aurelia, loyal blacksmith's apprentice Bran, and runaway troublemaker Felix, Marcus uncovers hidden tunnels, forbidden symbols, and a vault buried deep beneath the city. But every clue brings them closer to danger... and closer to a secret that could shake Londinium to its core.

Perfect for readers aged 9-12, The Lost Seal of Londinium blends real Roman history with fast-paced adventure, mystery, and friendship. If you love Rick Riordan, Michelle Paver, or historical mysteries, you'll love this thrilling journey into the shadows of ancient Britain.

The past is calling. Will Marcus be brave enough to uncover it?