Allison K Hymas

When a historical mansion opens to visitors, siblings twelve-year-old Charlie and thirteen-year-old Anna and their parents are granted a free weekend stay after Charlie wins a puzzle contest. Other guests, twelve-year-old Emily and her parents are on a mission to keep the mansion as a historical site. The three children come together when Charlie uncovers a numeric code on the walls, Anna discovers a secret passage, and Emily wants to find out the...

When twelve-year-old identical twins Peter and Kai accidentally raise an ancient sea god, they must delve into a world of hidden magic and dangerous puzzles to uncover the secrets of lost Atlantis and save their family and home.