Her promise just might be his undoing. To save Nord, Lina would do anything. Even bloodswear a vow to the infamous King of the Underground. But when Crombie comes to collect, no one is prepared for the chain of events he sets off. Now she’s missing, and Quinn and Finley must help Nord before he tears the world apart in his search for her. Because when a berserker’s mate is in jeopardy, there’s no line he won’t cross, no sin he won’t commit, to rescue her. Only a fool—or a fae prince—would be stupid enough to invoke a berserker’s wrath. And now everyone must answer to the monster he unleashed. Promise of Danger is book 4 in the Undercover Magic series and picks up right where World of Danger leaves off. You don't want to miss out on the next installment of this fast-paced, steamy, and downright addictive paranormal series!