Second Book in the Hidden Spark on Earth 'Beware the man with the scar on his face. He will be your greatest enemy.' Unicron may have been vanquished, but danger has not disappeared yet. In fact, a new danger is growing for Saphira, and the autobots. One who is keeping a close eye on her, waiting to strike. While Optimus and Megatron remain content to fight each other, it soon becomes evident their war no longer matters. For within Saphira grows the hope that the two mechs will finally settle their past so they can do what is right by her. Especially when Optimus learns that Saphira has feelings for Megatron just as she has feelings for him. By Primus's will, he and Megatron are put into situations where they must trust each other to ensure Saphira's safety. And learn to accept they both can love Saphira, and she can love both of them. Especially when Mech sees fit to try and rip the very thing that they are all fighting to protect. Decepticons and autobots, when either side no longer matters, and the very existence of the Cybertronians hang in the balance, the wrath of both mechs will be felt far and wide.

Sequel to the Heart of a Prime. Three years after escaping the ambush set by the military, Saphira had feared all connections with the autobots were lost. Especially to her sparkmate. She believed they were never coming back, and that she and Barricade were all that was left as they live quietly in the state of Wyoming. They hope that they are not to be found by anyone. However, when a familiar Prime eventually returns, with all of her old friends and new faces, she did not want to believe it. In fact, she almost down rights rejects them. Even when they tell her what really happened the last few years. She had been hurt and let down so often in the past, and she believed it would only continue. But with some wisdom from a man she barely knew, and the love she still carried for Optimus Prime, she finds herself following them back to Chicago to find out answers to questions. All the while, Saphira's dreams were plagued by a mysterious figure. And it seems that this same figure has begun to whisper into Optimus's processor. To the point where she didn't know what to believe. At least until the horns began to rise from the Earth.