Heart of valor

"When their friend, sorceress Morgana Shee, embarks on a mission to recover the Heart of Valor, a ruby giving the possessor almost limitless power, four children already in serious danger pursue her to offer their help."
"When their friend, sorceress Morgana Shee, embarks on a mission to recover the Heart of Valor, a ruby giving the possessor almost limitless power, four children already in serious danger pursue her to offer their help."@en
"When their friend, sorceress Morgana Shee, embarks on a mission to recover the Heart of Valor, a ruby giving the possessor almost limitless power, four children already in serious danger pursue her to offer their help. Sequel to "Night of the Solstice.""@en
"When an earthquake shakes California, Alys, Charles, Janie, and Claudia suspect it isn't a typical earthquake. A year and a half after their journey into the Wildworld, they believe that the Passage between their world, the Stillworld, and that parallel universe of legend and danger may no longer be stable. With their parents overseas and the great sorceress Morgana Shee traveling north to find the epicenter of the quake, the siblings are left on their own ..."@en