4.5 stars for this contemporary M/M paranormal romance. 
 Ryan is wrecked watching his only sister die of pancreatic cancer. Desperate to save her, and spare her daughter becoming an orphan, Ryan does something he can't even believe--he makes a pact with a demon, Zavier. For the exchange of his soul, his sister will be saved. Ryan is given a five year delay on collection, but when he seals the deal with Zavier something equally extraordinary happens--both men feel a deeper connection. 
 For Zavier, touching Ryan unlocks the history of his human life--the one he sacrificed when he made a pact with a demon to save the life of his dying lover, Ryan. Fifty years have passed since Zavier's contract came due and he entered Hell's ranks, but how could his new client Ryan have opened Zavier's locked memories? Zavier begins to investigate his own contract, with the help of a guardian angel and a lesser demon with mad computer skillz. The answers are as infuriating as they are shocking, and Zavier is torn between his demon duty and his love once lost. 
 I thoroughly enjoyed this romance. Do not be looking for lots and lots of steamy sex--there is a bit of physicality near the end, but it's a small part of this bittersweet story. The story is told from Ryan and Zavier's points of view, so we really get to see their insights, throughout. The descriptions of Hell are interesting and compelling--I definitely enjoyed the "corporate structure" and how the demons and angels jetted about with a touch of a cell phone. 
 The star-crossed love between Ryan and Zavier is allowed to develop in a new realm--with Ryan being a more equal partner in love than the man Zavier sacrificed his mortality for all those decades ago. Still, things happen fast. Zavier's boss is frustrated by his slip-shod efforts at signing new souls, and collecting souls come due. I adored Zavier's sense of morality--he's the anti-demon, all conscience and no avarice. His best friend is an angel, for goodness sake! 
 As Zavier works to protect Ryan from his own selflessness, Zavier makes the same mistake he did when he was human--and his keen protectiveness nearly ruins the tenuous love they are building, now. The end is nothing short of a miracle, but what can one expect when the angels hear your prayers. I know there are more books in this series planned, and I'm eagerly expecting Adrian (the guardian angel)'s story. I want that guy to find love again.