Hi sorry for not reading your message earlier, i actually went somewhere.
Unfortunately I wont be continuing the book (I’m so sorry).
But basically what happens is that Sonic and Sally become a couple (Sally’s nice in the story). Amy finds out and is heartbroken but is supportive of it but because her heart is breaking, Morgana possesses her and tries to destroy sonic and gang. Sonic and co (plus the trolls amy makes friends with) try and stop her which they do with some crystal. Sally realises what happens and breaks up with sonic, though sonic doesn’t mind and he gets with amy and they both kiss