Burning Lamp (The Arcane Society #8) by Jayne Ann Krentz
The Arcane Society was born in turmoil when the friendship of its two founders evolved into a fierce rivalry. Sylvester Jones and Nicholas Winters each sought to enhance their individual psychic talents.
Winters' efforts led to the creation of a device of unknown powers called the Burning Lamp. Each generation the Winters man who inherits it is destined to develop multiple talents - and the curse of madness.
Plagued by hallucinations and nightmares, notorious crime lord Griffin Winters is convinced he has been struck with the Winters Curse. And the instincts that have helped him survive the streets and rise to power are now drawing him toward Adelaide Pyne, the bothersome social reformer.
But even as he arranges a meeting with the mysterious woman, he has no idea how closely their fates are bound, for Adelaide holds the Burning Lamp in her possession.
A dreamlight reader, Adelaide should be able to manipulate the Lamp's light to save both Griffin's sanity and his life. But their dangerous psychical experiment makes them the target of forces both inside and outside of the Arcane Society.
And though desire strengthens their power their different lives will keep them apart - if death doesn't take them together