Friendship

In this fifth Sammy Keyes mystery, the normally unflappable heroine encounters a corpse, an arsonist, and an irate policeman - and her first real experiences with adolescent angst.

On a snowy night, Cara and her grandmother are pursued into St. Christopher's church by an unknown man. Clutching her grandmother's mysterious amulet, and following the old woman's instructions, Cara escapes their pursuer and falls into Luster, the world of the unicorns.

Bayern has triumphed in its war with Tira. But though the war is over, simmering anger remains among the Tirans and new hostilities could erupt at any moment. In a desperate attempt to maintain the peace, King Geric sends an ambassador to the Tiran capitol. Of course, an ambassador needs a military guard.

In The Lost Hero, three demigods named Jason, Piper, and Leo made their first visit to Camp Half-Blood, where they inherited a quest:

Seven half-bloods shall answer the call,
To storm or fire the world must fall.
An oath to keep with a final breath,
And foes bear arms to the Doors of Death.

Annabeth is terrified. Just when she's about to be reunited with Percy - after six months of being apart, thanks to Hera - it looks like Camp Jupiter is preparing for war. As Annabeth and her friends Jason, Piper, and Leo fly in on the Argo II, she can't blame the Roman demigods for thinking the ship is a Greek weapon.