A Time and a Place

"ENTERTAINING, CHAOTIC ADVENTURE." ~ Publishers Weekly.
Barnabus J. Wildebear is an ordinary guy who promises his sister on her deathbed that he'll keep her teen-aged son Ridley safe.
He fails.
First, they don't get along. Then a beautiful stranger lures the boy through a trans-dimensional portal to help battle an ancient evil. To protect Ridley, Barnabus must follow him through the portal to the strange and dangerous dimensions beyond, into the fog of alien war...
An ill-timed sneeze deposits Barnabus in the past, hours before his sister's tragic demise. Barnabus seizes the chance to change history and save his beloved sister. By so doing, maybe he can make all his terrible problems go away.
But can it really be that easy?