Reckless Series by Cornelia Funke, Oliver Latsch

Ever since Jacob Reckless was a child, he has been escaping to a hidden world through a portal in his father's abandoned study. Over the years, he has made a name for himself as a finder of enchanted items and buried secrets. He's also made many enemies and allies--most important, Fox, a beautiful shape-shifting vixen whom Jacob cares for more than he lets on.But life in this other world is about to change. Tragedy strikes when Jacob's younger brother, Will, follows him through the portal... moreEver since Jacob Reckless was a child, he has been escaping to a hidden world through a portal in his father's abandoned study. Over the years, he has made a name for himself as a finder of enchanted items and buried secrets. He's also made many enemies and allies--most important, Fox, a beautiful shape-shifting vixen whom Jacob cares for more than he lets on.But life in this other world is about to change. Tragedy strikes when Jacob's younger brother, Will, follows him through the portal. Brutally attacked, Will is infected with a curse that is quickly transforming him into a Goyl--a ruthless killing machine, with skin made of stone.Jacob is prepared to fight to save his brother, but in a land built on trickery and lies, Jacob will need all the wit, courage, and reckless spirit he can summon to reverse the dark spell--before it's too late. less

With the fatal fairy moth on his chest giving only a few months to live, Jocob Reckless tries, the blood of a Northern Djinn, then a mythical crossbow that can kill thousands, or heal one, when shot through the heart. But famed Goyl assassin treasure hunter is also searching for the prized crossbow. Jacob must find it first--and somehow convince Fox to do whatever it takes to save him.

Jacob Reckless continues to travel the portal in his father's abandoned study. His name has continued to be famous on the other side of the mirror, as a finder of enchanted items and buried secrets. His family and friends, from his brother, Will to the shape-shifting vixen, Fox, are on a collision course as the two worlds become connected... moreJacob Reckless continues to travel the portal in his father's abandoned study. His name has continued to be famous on the other side of the mirror, as a finder of enchanted items and buried secrets. His family and friends, from his brother, Will to the shape-shifting vixen, Fox, are on a collision course as the two worlds become connected. Who is driving these two worlds together and why is he always a step ahead?This new force isn’t limiting its influence to just Jacob’s efforts – it has broadened the horizon within MirrorWorld. Jacob, Will and Fox travel east and into the Russian folklore, to the land of the Baba Yaga, pursued by a new type of being that knows our world all to well. less

The fourth adventure in the enchanted Mirrorworld leads to the Far East, where Jacob and Fox finally track down Will, who is travelling with a one of Jacob's worst enemies. Putting his feelings aside, Jacob agrees to travel with them to the beautiful Island of the Foxes in quest of another magical Mirror.But their search quickly brings more peril in this land of dark forests, lush palaces and shapeshifters... moreThe fourth adventure in the enchanted Mirrorworld leads to the Far East, where Jacob and Fox finally track down Will, who is travelling with a one of Jacob's worst enemies. Putting his feelings aside, Jacob agrees to travel with them to the beautiful Island of the Foxes in quest of another magical Mirror.But their search quickly brings more peril in this land of dark forests, lush palaces and shapeshifters. As Jacob seeks security for himself and Fox, he is haunted by a disturbing pledge he once made that now threatens everything.Full of fairy tales and legends, old friends and new enemies, The Silver Tracks is the long-awaited fourth volume in the thrilling Reckless series. less

In a land of elves, mermaids and trolls, true magic is where you least expect it...In the snow-covered city of Londra, young Tabetha survives by finding treasures in the mudbanks of the river Themse. On Christmas Eve, a sinister stranger asks her to keep her eyes open for a priceless, long-lost magical object: the Glass of Lead and Gold.As word of the Glass spreads across the city, Tabetha finds herself with some unlikely companions, not least a one-armed girl and a rather impressive soup chef... moreIn a land of elves, mermaids and trolls, true magic is where you least expect it...In the snow-covered city of Londra, young Tabetha survives by finding treasures in the mudbanks of the river Themse. On Christmas Eve, a sinister stranger asks her to keep her eyes open for a priceless, long-lost magical object: the Glass of Lead and Gold.As word of the Glass spreads across the city, Tabetha finds herself with some unlikely companions, not least a one-armed girl and a rather impressive soup chef. But will Tabetha discover that there are even greater fortunes to be found than the magical Glass? less