Celebrating the end of exams with best friend Grace, 17-year-old Alex rescues a swan caught on a wire in the Thames mud and finds an extraordinary bracelet. Through its disturbing and compelling powers, she finds Callum, a soul locked in a half-life of sadness and mystery following a terrible accident, and his persuasive and sinister sister, Catherine. As Alex and Callum grow closer despite the enormous obstacles to their love, the dangers mount until Alex must risk everything to save Grace and Callum must risk everything to save Alex.

This is the second book in the Small Blue thing trilogy. Still recovering from her earlier brush with death, Alex's source of strength and comfort is Callum, still locked in a sad half-life after drowing in the river Fleet that flows into the Thames. And she needs all the strength and comfort she can someone is out to make her life a misery, and someone is out to get hold of the extraordinary bracelet that enables her to communicate with Callum.

Alex knows there's a way that she and Callum can be together. Catherine holds the key to unlocking the secret but she's disappeared. Olivia has answers, too, but they're hidden deep inside her troubled mind and won't be found. It seems impossible but Alex can't give up. The question is, how much will she risk to be with the one she loves? Could it be everything?