Detective Liam O'Connor plays by the rules. Firefighter Tess Donovan breaks them. They have nothing in common except a powerful attraction—and a case that keeps throwing them together. When a series of suspicious fires points to a dangerous arsonist, Liam is assigned to investigate, and Tess, a key witness, is determined to help. As they navigate a treacherous web of clues and deceptions, the cold Minnesota winter isn't the only thing heating up. But when the arsonist's attention turns personal, Liam must break all his own rules to protect the woman who has melted the ice around his heart.