My husband's lover. They said her death was a tragic accident. And I believed them . . . until now.

Carmen is happily married to Tom, a successful London lawyer and divorcé with three children. She is content to absorb the stresses of being a stepmother to teenagers and the stain of 'second wife'. She knows she'll always live in the shadow of another woman - not Tom's first wife Laura, who is resolutely polite and determinedly respectable, but the lover that ended his first marriage: Zena. Zena who was shockingly beautiful. Zena who drowned swimming late one night.

But Carmen can overlook her husband's dead mistress . . . until she starts to suspect that he might have been the person who killed her.

'Absolutely gripping, I raced through Undertow at the speed of knots' Rosamund Lupton.

"An immersing story, reminiscent of Daphne du Maurier's Rebecca . . . The "hidden currents" that keep us submerged in Undertow are not only those of the sea, but the fear and suspicion that swell catastrophically through the most intimate relationships" - Observer

"Absolutely gripping, I raced through Undertow - if you've got a journey to go on, an appointment to wait for, then pick it up and watch the time disappear" - Rosamund Lupton, Richard and Judy bestselling author

"A tense, gripping thriller that kept me turning the pages long into the night, desperate to know whom to trust" - Tammy Cohen, author of When She Was Bad

"The market is absolutely flooded with psychological thrillers at the moment, and it takes something really special to stand out. Take a bow, Elizabeth Heathcote, because this chilling, twisty and hugely atmospheric tale is standing head and shoulders above the rest . . . This slow-burn tale sneaks up and grabs you by the throat, right when you least it expect it. Brilliant!" - Heat

"Buckle up for this gripping psychological thriller" - Marie Claire