5.5 stars rounded down to 5.This is one of those rare books that stands out amongst the crowd of good books. It has everything going for it. Great start that sucked me right in. Witty banter by characters who still sounded like adult males. A plausible plot which carried the action throughout in a nice balance with the growing connection between the two men. Avoidance of stereotypes. Unusual setting and professions and great research. Stir that all together with great craft and you have compounded a great product.(Okay, maybe I'm a tad biased because I'm a Pharmacist, but that was the 0.5 I eventually had to deduct!)