There are 4 books in the The Cogheart Adventures series. The newest book is Shadowsea which came out in 2020.

1
Cogheart

Book cover of Cogheart
The first in the bestselling Cogheart Adventures series, where mayhem, murder and mystery meet in a gripping Victorian world of fantastical imagination.

Some secrets change the world in a heartbeat.

Lily's life is in mortal peril. Her father is missing and now silver-eyed men stalk her through the shadows. What…
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2
Moonlocket

Book cover of Moonlocket
A thrilling tale of catastrophe and courage... The exhilarating second Cogheart Adventure: the bestselling series of fantastical imagination set in a gripping Victorian world, from award-winning Peter Bunzl.

It's hard to escape the secrets from the past.

Storm clouds gather over Lily and Robert's summer when criminal mastermind the Jack…

3
Skycircus

Book cover of Skycircus
Treachery, tight-ropes and trickery combine in this incredible third Cogheart Adventure: the bestselling series of fantastical imagination set in a gripping Victorian world, from award-winning Peter Bunzl.

Old secrets can weigh heavy when you want to fly.

Invited to a one-off spectacular show by Slimwood's Stupendous Travelling Skycircus, Lily, Robert…

4
Shadowsea

Book cover of Shadowsea
Murder, mayhem and mystery meet in the gripping Victorian world of the bestselling series,The Cogheart Adventures... Join Lily, Robert and Malkin on a fantastic voyage of terror and triumph in Shadowsea, their fourth and final adventure, from award-winning Peter Bunzl.

Dark secrets never stay submerged for long.

Swept into the…