Familiars and Foes by Helen Vivienne Fletcher

An old crush. A long-lost family member. A magical Labrador and a whole load of ghosts… At least Adeline can’t say life is boring!

Adeline yearns for family, but for years, the closest she’s gotten is her assistance dog, Coco.
When a frightening encounter with a ghost brings an old friend back into her life, it seems like Adeline’s about to find the companionship she’s been missing.
But her crush might have to wait. As the ghost’s smoky presence increases around Wellington, Adeline feels its hold on those around her tightening dangerously.
Will Adeline figure out the source of the ghostly smoke, or will her chance at happiness go up in flames?