Format: E-Book
Read with: Kindle Oasis
Length: Novel
Genre: Contemporary Romance
POV: Third Person, Dual
Series: Marriage by Command, #3
Publisher: Harlequin
Hero: Navarre Cazier
Heroine: Tawny Baxter
Sensuality: 🔥🔥🔥
Published On: April 20, 2012
Started On: January 06, 2026
Finished On: January 08, 2026

I was beginning to worry that something was seriously wrong with me because none of the books that I had picked up of late were doing it for me. Then came along, A Vow of Obligation. There is something deliciously old-school about the story, the kind of romance that leans unapologetically into heightened emotion, combustible chemistry, and larger-than-life characters without ever losing its charm. From the very first encounter, this story announces itself as a classic Lynne Graham setup with a sharp edge: a powerful billionaire, a working-class heroine caught in circumstances beyond her control, and a proposition that changes everything.
Tawny Baxter is immediately compelling as a heroine. Young, fiercely honest, and refreshingly untheatrical, she is not easily cowed by wealth, authority, or intimidation. Her predicament begins with a well-meaning but disastrous act of loyalty, and the way she handles being caught off guard speaks volumes about her character. Tawny does not posture or perform innocence for sympathy; she meets situations head-on, says exactly what she thinks, and refuses to be molded into something more convenient for anyone else.
Navarre Cazier, on the other hand, is peak Graham hero material. Self-made, ruthlessly controlled, and deeply commitment-phobic, he operates from a place of emotional self-preservation disguised as dominance. His wealth and power are not romanticized so much as weaponized, especially early on, yet it is precisely Tawny’s refusal to be dazzled or intimidated that unsettles him. The sexual tension between them is visceral and immediate, crackling beneath every interaction, made all the more potent by Tawny’s quiet vulnerability and Navarre’s rigid need for control.
As their arrangement draws them closer, the story digs into deeply rooted fears on both sides. Tawny’s mistrust of wealthy men is grounded in lived experience rather than insecurity, and Navarre’s resistance to emotional attachment stems from the same. What unfolds is not just desire, but a steady erosion of defenses, where power dynamics shift and neither character emerges unchanged. The stakes rise naturally as consequences assert themselves, forcing both to confront what they truly want versus what they have always believed was safest.
What worked particularly well here was the balance between intensity and readability. The chemistry is combustible without tipping into melodrama, and Tawny’s straightforward nature makes her one of the more satisfying heroines in Graham’s catalog. Navarre, for all his arrogance, is consistently challenged, and watching him struggle against a woman who cannot be bought, silenced, or neatly discarded is immensely rewarding. The bombshell of a twist at the end was one I did not see coming, but the story ended on such a high note, because of the same.
Recommended for: Readers who love classic billionaire romances with sharp heroines, intense sexual tension, fake engagements that spiral into something far more dangerous, and alpha heroes who finally meet their match.
Final Verdict: A sharp, highly readable romance with explosive chemistry, a fearless heroine, and a commitment-phobic hero undone by the one woman he cannot control. A reminder of why Lynne Graham does intensity so well.
Favorite Quotes
‘I’m a virgin!’ she launched across the room at him in stark condemnation. ‘How many virgins do you know who sell themselves for money?’
I am not having this crazy argument, Navarre’s clever brain told him soothingly as he cast down the remote control he had used to switch on the business news. She’s a lunatic. I’ve hired a thief and a lunatic…
‘I don’t know any virgins,’ Navarre told her truthfully. ‘But that’s probably because most of them keep quiet about their inexperience.’
‘I don’t see why I should keep quiet!’ Tawny snapped, tilting her chin in challenge. ‘You seem to be convinced that I would do anything for money…but I’m not like that.’
‘We’re not having this conversation,’ Navarre informed her resolutely, stonily centring his attention back on the television screen.
Navarre reached out and entwined his long brown fingers into the curling spirals of red hair that were brushing his chest. For a timeless moment his eyes held her as fast as manacles. ‘Don’t tease—’
Her bosom swelled as her temper surged over the rebuke. ‘I wasn’t teasing!’
‘You mean that you didn’t tell me you were a virgin to whet my appetite for you?’ Navarre derided.
‘No, I darned well didn’t!’ Tawny snapped furiously. ‘I only told you in the first place because I thought it would make you understand why I was offended by your assumption that my body has a price tag attached to it!’
‘I’m not a child you left behind in need of care and protection!’ Tawny objected, ice-blue eyes stormy as he ignored the comment and virtually dragged her onto the dance floor with him. ‘Why are you behaving like this, Navarre? Why are you acting like I’ve done something wrong?’
‘Haven’t you? If I leave you alone for five minutes I come back to find you flirting with another man!’ he censured with icy derision, splaying long sure fingers to her spine to draw her closer to his hard, powerful body than she wanted to be at that moment.
The scent of him, clean, warm and male, was in her nostrils and she fought the aphrodisiac effect that proximity awakened in her treacherous body. ‘You left me alone for two hours!’
‘Was it too much for me to expect you to be waiting quietly where I left you?’ Navarre prompted shortly, in no mood to be reasonable.
‘Yes, I’m not an umbrella you overlooked and I wasn’t flirting with Tor! We were simply talking. He knows I’m engaged,’ Tawny snapped up at him, tempestuous in her own self-defence.
‘I’m leaving tomorrow,’ he told Tawny without any expression at all.
Tawny smiled as brightly as if she had won an Olympic race. ‘Elise mentioned it.’
‘I’ll drop you off at home on the way to the airport. I have your phone number and I’ll stay in touch…obviously,’ he added curtly.
‘It’s not going to happen,’ Tawny responded soothingly, guessing what he meant. ‘My egg and your sperm are more likely to have a fight than get together and throw a party for three!’
His face darkened. ‘I hope you’re right, ma petite. A child should be planned and wanted and cherished.’
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