The Earl's Defiant Wallflower (Dukes of War Book 1) - Erica Ridley

His father - per the subsequent scandal sheets - had come to his untimely end in the bed of his latest mistress when her cook, unaware of his seafood allergy, had sent a tray of salad tossed with lime and prawn to the lovers' boudoir.

 

Death by salad. And just like that, Oliver inherited an earldom.