Harleigh Sinclair and the Kingdom of the Bristol Skull

An Egyptian ankh. An Inuit mask. A Skinwalker's scythe.
Three Neotact artifacts have been found. Only the shield and sword remain.
My name is Harleigh Sinclair. I have a gift to find lost artifacts, though there are some who call it a curse...
When I discover a riddle etched inside a goldstone skull, it may be the clue I need to discover not only the Viking shield, but the famed sword of King Arthur, Excalibur.
After my father was attacked by a Blood Raider over a decade ago, and his sword stolen, my life's mission has been to find his attacker and bring justice to our family. But before I can find the attacker, I must first discover the original four artifacts before the Blood Raiders obtain them first.
With the aid of the insufferable and dangerously handsome Jagg Ransom, plus my sister and a team of handpicked experts, we follow the riddle's clues. Our search leads us from a Viking museum in Norway, to underground crypts in Bristol, England, and finally to a forest haunted by a legendary hellhound. But we're not alone.
The Blood Raiders have gotten desperate. And they've been following us. If we don't find the shield first, they'll attain more power than we can comprehend, and not only will we fail, but we'll be doomed to die at their hands.