As The Nightingale Circus begins a quest to deliver a power source that has the potential to change the outcome of the war in the Far East, their efforts are thwarted when Nicholas is apprehended by French authorities.
Meanwhile, Dale stays in Bratislava to protect Aurore and her power source. When the largest weapons manufacturer in Europe discovers her secret, the chase is on.
With a tracker hot on their heels, Dale and Aurore struggle to stay one step ahead. Their dangerous journey takes them across Europe and leads them to the only ones who can help them – The Nightingale Circus.