Join four youngsters as they embark on an amazing seaside adventure. It all starts when twelve-year-old Jack has a chance meeting on Abersoch beach with a headstrong girl of the same age called Lou. She becomes friends with Jack, his brother David and sister Emily. They join her in hot pursuit of smugglers targeting the remote coastline of Wales's Lleyn Peninsula. The children undertake a thrilling and at times dangerous quest to uncover illegal activities. Their journey takes them to a woodland den, an uninhabited island, a deserted cove and a disused manganese mine. This is the first book...

Lou, aged 12, goes camping with her friends Jack, his brother David and sister Emily on farmland near the historic city of Lichfield in Staffordshire, on the hunt for missing treasure. Bookworm David is convinced that a hoard of Anglo-Saxon gold and silver remains undiscovered near to where the famous Staffordshire Hoard was dug up. The others think that's nonsense, but so what? It's a great excuse to get together again for their second adventure. Emily, still only 10, is scared they'll encounter danger again. The older children reassure her but what they didn't bargain for was feisty...

It's Autumn half-term and Louise Elliott, still only 12, has run away to her parents' holiday cottage at the Welsh seaside resort of Abersoch. That's great news for her friends Jack, David and Emily, who have also returned for a week's break with their parents and are delighted to see her again. The children set off for a walk across moorland above the neighbouring village of Mynytho. They come across a ramshackle farmhouse owned by a worried, elderly lady who is convinced it's haunted. But is it, or is her imagination getting the better of her? Lou is determined to find out. This is book...

Another miserable Christmas looms ahead for Lou, but her friends Jack, David and Emily come to the rescue. They persuade their parents to let her stay with them at their home in Malpas, Cheshire. Lou, now 13, is delighted at the prospect of experiencing a traditional, family Christmas at last. She just wants to enjoy herself, but there's work to be done. A thief is targeting Chumley Towers, the nearby stately home, making off with numerous valuable items. Lord and Lady Somerset are struggling to keep going as it is and this could be the final straw. The police haven't got a clue who the...