The missing skull

"A trip to a remote lake in northern Ontario with his grandfather doesn't thrill Steve, especially since his twin brother, DJ, was taken to Central America. Matters start to look up when his grandfather tells Steve about the mysterious death of the artist Tom Thomson and sets him the task of finding Thomson's missing skull. Steve loves mysteries, but when odd things begin happening and strange people start threatening him, Steve wonders whether this is part of his grandfather's plan. Is this still a simple puzzle, or is something far more sinister going on?"--Amazon.com.