The PCs answered Botanica Budwhizzle's request, agreeing to smuggle a unicorn named Temper into Waterdeep for the accomplished botanist. They hired a tout to travel into the Undermountain and make their way to Skullport, where they encountered Rohr Hancleft, a corrupt half-elf merchant. Rohr made off with their money and the unicorn, leaving the PCs for dead in Skullport. Things turned around for the merchant, however, when the PCs tracked him to his lair.
Outside Rohr's lair, the PCs encountered the flirtatious Esta, who was tied up by a couple of thugs. They rescued her, and Esta offered to help them in exchange for a portion of the loot. The PCs agreed at first.
Esta and the PCs fought their way into Rohr's lair, but things went awry when they no longer agreed to offer Esta any loot and without her aid, they were badly hurt by the thugs. They retreated and holed up for some time. They pressed onward, fought Rohr (who almost eliminated them, but fled) and as they recuperated, they met Esta again. Esta had dealt the final blow to Rohr, taking all the belongings including the money for the unicorn. The PCs attacked Esta for the money, but she fled.
Without the money but with the unicorn, the PCs returned to Waterdeep and were attacked by a group of grimlocks trying to steal the horse from them. They made their way back, giving Temper an ornate headdress to hide his horn. When they got to the drop-off point, things went South.
Waiting for them was Gareth Rivalum, head of the Honourable Society for Magical Creatures, They talked their way out of serious prosecution, but in turn they gave Temper up to Gareth.