Nose: Raisin, pineapple, cardamom, ginger, even a bit of black tea and definitely some spiciness there. Part of me conjures a bit of bruised plum in this, which maybe taints the smell just a bit.
Taste: Comes in sweet and tart and some of the maple syrup starts to shine through with a nicely citrus taste on the tongue, and the cardamom and spices come up through the nose to really round out the flavor. Swallowing then produces a lingering peppery/gingery hit to the tongue and throat, but not in a capsicum way, like a strong ginger despite not being strongly ginger in flavor, and a hint of clove lingers on the tongue, even a hint of coffee to it. It's very difficult to describe. Perhaps even a bit of a fooler for alcohol, with the heat not happening at all until the end and lingering just a bit longer than it would, but that is not a bad thing here. That heat doesn't go down to the belly the way an alcoholic nightcap would, but that's not necessarily a bad thing, either. There is a bit of deeper throat heat but that could be more of the acidity, in some ways, which detracts a little from this as a true nightcap since it may be a bit like heartburn for those who may suffer from that in the evenings after imbibing too much or something too acidic.
Neat, a bit cooler than room temperature (cellar temperature, like a German beer would be served) it's maybe a bit too thick and syrupy but still not bad. Using their preferred recommendation over ice thins it out just enough and adds complexity, I feel, in that the cold seems to almost separate the flavors some as it goes from fruit and a bit sweet forward to quickly changing character as it warms a bit in the mouth and what's left after swallowing warms and linger layering in ever more flavors. This is quite complex in character, in my opinion, but in a really good way. My favorite way is in a caffeine free tea (chamomile does nicely) with just a bit of honey and about 1 1/2oz of Nightcap. So good and really lets it live up to the name as a drink to savor and enjoy before bedtime.