The Romeo and Julian Effect — Hayden Thorne

Book 3 of the Cecilian Blue-Collar Chronicles

Intimidation from the underworld is escalating, this time involving a person from Sheridan's past who really shouldn't be hanging around Sheridan if he knew what's best for him. Shapeshifting demons come out to harass Sheridan in the most hilariously bizarre ways imaginable, and with the help of defensive-wish-granting knight, Clonia, and some space-age technology, Sheridan proves himself a worthy opponent.

In the meantime, Yuli Soulweaver's beginning to display alarming symptoms of fatigue, possibly from the prince's constant crossing over between two worlds in order to court Sheridan -- unless a more ominous reason lies behind Yuli's spiraling weakness.

Nobody messes with a Diggins, however, and the more Sheridan meets resistance from antagonistic entities from the underworld, the harder he fights back. Disgruntled immortals might very well be in for a huge surprise in their campaign of terror against a young colonist with nothing to lose and everything to gain.