Winner of the Tir na n-Og AwardLonglisted for the Carnegie MedalIt is the year 454AD. The Roman Empire has withdrawn from Britain, throwing it into the chaos of the Dark Ages. Mai has been kept safe by her father and her sister, Haf. But when Saxon warriors arrive at their farm, the family is forced to flee to the hills where British warlords lie in wait. Can Mai survive in a dangerous world where speaking her mother tongue might be deadly, and where even the people she loves the most can't be trusted?

Cassie's older brother Byron has fallen in with the wrong crowd – it's soon clear these boys are wild, reckless and not human at all. They are tylwyth teg – Fair Folk, who tempt humans down into the dark places of the world. And Byron is tempted.When he goes missing, Cassie and her cousin, Siân, follow his trail to an old abandoned railway tunnel which goes down and down into Annwn, the underworld. Here they find that the tylwyth teg are restless – and angry. Their leader, Gwenhidw, wants to protect Annwn from the damage humans are doing to the world. Byron is part of her plan. But Cassie won't let her big brother be part of anyone's plan. Can she rescue her brother before it is too late?

The final title in the brilliant Marsh Road Mysteries adventure series by hugely popular children's author Elen Caldecott. For fans of the Laura Marlin Mysteries by Lauren St John.Meet Piotr, Minnie, Andrew, Flora and Sylvie – the Marsh Road Mystery solvers.Sylvie Hampshire is in hospital. She knows she's responsible enough to take control of her diabetes medication, but now she has to prove it on the hospital ward. She's only been there a couple of hours when Barry, a therapy dog, goes missing in suspicious circumstances. It's time to bring in the gang! With their detective senses on high alert, the five friends set out to find Barry, but the stakes soon become much higher than they thought. Have they finally met their match? Not if Sylvie Hampshire has anything to do with it!