Fireheart, a full-fledged warrior cat, must confront questions of loyalty and identity as he faces the possibility of betrayal from within his own forest clan.

For generations, four Clans of cats have shared the forest. But ThunderClan is in grave danger, and ShadowClan grows stronger every day. In the midst of this turmoil appears a house cat named Rusty ... who may turn out to be the bravest warrior of them all.

In San Diego in 1918, as deadly influenza and World War I take their toll, sixteen-year-old Mary Shelley Black watches desperate mourners flock to séances and spirit photographers for comfort and, despite her scientific leanings, must consider if ghosts are real when her first love, killed in battle, returns.

Socks, the Bricker's cat, finds a new rival in the form of the Bricker's new baby, Charles William, until he and the baby become partners in mischief.

The questing cats return to a forest devastated by the Twolegs, where they must find a way to convince their Clans to leave in search of a new home, even though they have no idea where they are going.

Amidst ongoing strife within and between the Clans of warrior cats, Brambleclaw is tempted by the dark plans of his father and brother, and the meaning of Leafpool's ominous visions becomes clear.

Harry the cat, his little sister Emily, and their parents all play tricks on each other for April Fools' Day.

When Firestar's grandchildren, Hollyleaf, Lionblaze, and Jayfeather, finally discover who their true parents are, there are dire consequences for ThunderClan and the Warrior Code.

Tigerclaw is back and more dangerous than ever as the new leader of ShadowClan, but he is not the most terrifying enemy Fireheart must face as a new force sweeps through the woods.