He was the last man she should trust.
Unfortunately, he may be the only man who can keep her alive.
Mara Ellery never wanted to return to Bellgrave.
But after her brother's death, she comes home to unanswered questions, a crumbling inheritance, and Black Glass-the hotel her family has guarded for generations.
Waiting inside is Cassian Thorne.
Cold. Powerful. Dangerous.
And connected to every secret Mara has been trying to uncover.
Cassian doesn't believe in innocence. He believes in leverage, loyalty, and making certain his enemies never get a second chance.
Mara should hate him.
Instead, she finds herself drawn deeper into his world.
Then an old legal clause changes everything.
There is only one way to keep Black Glass out of the hands of the people who destroyed their families:
An Ellery must marry a Thorne.
Their marriage is supposed to be a contract.
No love.
No promises.
No surrender.
But forced proximity turns hatred into temptation, temptation into obsession, and their carefully constructed arrangement into something neither of them knows how to survive.
Because Cassian has secrets of his own.
And when Mara finally discovers what he did to protect her-and what he failed to protect her from-the truth may destroy the one thing neither of them planned to give away.
Their hearts.
A Vow Beneath Black Glass is a dark romantic suspense novel filled with dangerous secrets, a morally gray hero, enemies-to-lovers tension, forced proximity, marriage of convenience, obsession, betrayal, and a hard-earned happily ever after.
Some vows are spoken out of love.
Others are written in blood.